| A | Object code library |
| A | Library file (Unix) |
| AA | Audible audio file (commonly used for downloadable audio books) |
| AAM | Authorware shocked file |
| AAS | Authorware shocked packet |
| AB | Applix Builder file |
| ABF | Adobe Binary Screen Font |
| ABK | Backup file (PrintMaster Gold) |
| ABK | Corel Draw AutoBackup |
| ABM | Audio album file (HitPlayer) |
| ABO | Applix Builder Turbo file |
| ABS | MPEG Audio Sound file |
| AC$ | AutoCAD Undo Info file |
| ABS | Standard GNU compiler output file for a PC platform |
| ABS | Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) AutoBackup |
| ACA | Project Manager Workbench file |
| ACA | HTTP animation file (Microsoft Agent) |
| ACB | ACBM Graphic image |
| ACC | DR-DOS Viewmax file |
| ACD | Character definiton file (Microsoft Agent) |
| ACE | ACE Archiver Compression file |
| ACF | HTTP character file (Microsoft Agent) |
| ACI | ACI development appraisal (ACIWEB) |
| ACL | Corel Draw 6 keyboard accelerator file |
| ACM | Windows system directory file |
| ACM | Interplay compressed sound file (Fallout 1,2, Baulder's Gate) |
| ACM | Dynamic Link Library (DLL) |
| ACP | Microsoft Office Assistant Preview file |
| ACR | American College of Radiology file |
| ACS | Character structered storage file (Microsoft Agent) |
| ACT | Microsoft Office Assistant Actor file |
| ACT | FoxPro Foxdoc Action Diagram |
| ACT | Action Presentation |
| ACT | Documenting wizard action diagram (Microsoft Visual FoxPro) |
| ACV | Used to Compress and decompress audio data |
| AD | After Dark screensaver |
| Ada | Ada source text file (non-GNAT) |
| ADB | Ada source text body file (GNAT) |
| ADB | HP 100LX Organizer Appointment database |
| ADC | Scanstudio 16 color Bitmap Graphic file |
| ADD | OS/2 adapter driver file used in the boot process |
| ADF | Amiga disk file |
| ADI | AutoCAD device-independent binary plotter file |
| ADL | QEMM Mca adaptor description library |
| ADM | After Dark MultiModule screensaver (Microsoft) |
| ADM | Windows NT policy template |
| ADN | Lotus 1-2-3 Add-In file |
| ADP | Dynamic Page file (AOLserver) |
| ADP | FaxWorks Faxmodem setup file |
| ADP | Astound Dynamite file |
| ADR | After Dark Randomizer screensaver |
| ADR | Smart Address address book |
| ADS | Ada source text specification file (GNAT) |
| ADT | HP NewWave datafile for card applications |
| ADT | AdTech Fax file |
| ADX | Dynazip Active Delivery script |
| ADX | Lotus Approach dBase Index |
| ADX | Archetype Designer Document |
| ADZ | Packed ADF file (Extracts with WinZip) |
| AE | Author/Editor file (SoftQuad) |
| AEP | ArcExplorer project file |
| AF2 | ABC FlowCharter 2.0 Flowchart |
| AF3 | ABC Flowchart |
| AFC | Apple Sound file |
| AFI | Truevision Bitmap graphic |
| AFM | Adobe metrics |
| AFM | HP NewWave Cardfile application |
| AG | Applix graphic |
| AI | Adobe Illustrator drawing |
| AI | Corel Trace drawing |
| AIF | Audio Interchange File, a sound format used by Silicon Graphics and Macintosh applications |
| AIFC | Similar to AIF (compressed) |
| AIFF | Similar to AIF |
| AIM | AOL Instant Messenger Launch file |
| AIN | AIN Compressed archive |
| AIO | APL transfer file |
| AIS | ACDSee Image Sequence |
| AIS | Velvet Studio Instruments file |
| AIS | Xerox Arry of Intensity Samples Graphic |
| AIX | HP NewWave Cardfile Application data |
| AKB | HaleyAuthority Authority Knowledge Base File |
| AKW | Contains all A-keywords in the RoboHELP Help Project Index Designer not associated with topics |
| ALAW | European Telephony audio |
| ALIAS | Alias Image |
| ALB | JASC Image Commander album |
| ALI | Document file (SAP proprietary format) |
| ALL | Arts & Letters Library |
| ALL | WordPerfect for Windows General printer information file |
| ALS | Alias Image |
| ALT | WordPerfect Library Menu |
| AM | Applix SHELF Macro |
| AMF | Music file (Advanced Module Format) |
| AMF | DSMIA/Asylum module music (Crusader,No Remorse,Aladdin) |
| AMG | AMGC Compressed Archive File |
| AMG | ACTOR System image |
| AMI | Annotation file (Cocreate SolidDesigner) |
| AMS | Velvet Studio music module (MOD) File |
| AMS | Extreme's Tracker Module |
| AMU | Sony Photo Album |
| AN | Text file (Sterling Software) (Groundworks COOL Business Team Model) |
| ANC | Canon Computer Pattern Maker file that is a selectable list of pattern colors |
| ANI | Microsoft Windows Animated cursor |
| ANM | DeluxPaint Animation |
| ANN | Windows 3.x Help annotation |
| ANS | ANSI Text file |
| ANT | SimAnt for Windows saved game |
| AOM | Adobe After Effects Output Settings |
| AOM | Adobe Download Manager Online Manager Shortcut |
| AOS | Nokia 9000 Add-on software |
| AOT | Applicatio binary object template file (ZenWorks snAPPshot) |
| AP | Applix Presents file |
| AP | WHAP Compressed Amiga archive |
| APC | Compiled application file (Centura Team Developer) |
| APC | Lotus 1-2-3 Printer driver |
| APD | Dynamic application library file (Centura Team Developer) |
| APD | Lotus 1-2-3 Printer driver |
| APE | Monkey's Audio Lossless Audio Compression Format |
| APE | Winamp Plugins AVS File |
| APF | Lotus 1-2-3 Printer driver |
| APF | Project file (Allaire) (Created by Homesite) |
| API | Application Program Interface; used by Adobe Acrobat |
| API | Lotus 1-2-3 Printer driver |
| APL | Application library file (Centura Team Developer) |
| APL | APL Workspace file |
| APP | Normal mode application file (Centura Team Developer) |
| APP | Symphony Add-in Application |
| APP | Generated application or active document (Microsoft Visual FoxPro) |
| APP | dBase Application Generator Object |
| APP | DR-DOS Executable Application |
| APP | FoxPro Generated Application |
| APR | ArcView project file |
| APR | Employee Appraiser Performance Review file |
| APR | Lotus Approach 97 View file |
| APS | Microsoft Visual C++ file |
| APS | Advanced patching systems with error checking, (Similar to IPS) |
| APT | Lotus Approach Data view file |
| APT | Text mode application file (Centura Team Developer) |
| APX | Lotus Approach Paradox-Specific information file |
| APX | Borland C++ Appexpert database |
| AQ | Applix data |
| ARC | LH ARC (old version) compressed archive |
| ARC | SQUASH Compressed archive |
| ARF | Automatic Response file |
| ARI | ARI Compressed archive |
| ARI | Aristotle audio file |
| ARJ | Robert Jung ARJ compressed archive (ARJ) |
| ARK | ARC File Archiver CPM/Port archive |
| ARL | AOL v4.0 organizer file |
| ARR | Atari Cubase Arrangement |
| ART | Xara Studio drawing |
| ART | Canon Crayola art |
| ART | Clip Art |
| ART | Ray Tracer file |
| ART | First Publisher Raster graphic |
| ART | AOL Image file compressed using the Johson-Grace compression algorithm |
| ARX | ARX Compressed Archive |
| ARX | AutoCAD Runtime Extension |
| AS | Applix Spreadsheet |
| ASA | Microsoft Visual InterDev file |
| ASC | ASCII text file |
| ASC | PGP armored encrypted file |
| ASD | WinWord AutoSave file |
| ASD | Lotus 1-2-3 Screen driver |
| ASD | Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX |
| ASD | Astound Presentation |
| ASE | Velvet Studio Sample file |
| ASF | Music file (Electronic Arts) |
| ASF | Microsoft Advanced Streaming Format |
| ASF | StratGraphics Datafile |
| ASF | Lotus 1-2-3 Screen font |
| ASH | TASM 3.0 Assembly language header |
| ASI | Borland C++/Turbo C Assembler Include file |
| ASM | Assembler Language source file |
| ASM | Pro/E assembly file |
| ASO | Astound Dynamite Object |
| ASP | Active Server Page (an HTML file containing a Microsoft server-processed script) |
| ASP | Procomm Plus setup and connection script |
| ASP | Astound Presentation |
| AST | Astound multimedia file |
| AST | Claris Works "assistant" file |
| ASV | DataCAD Autosave file |
| ASX | Cheyenne Backup script |
| ASX | Microsoft Advanced Streaming Redirector file |
| ASX | Video file |
| AT2 | Aldus Persuasion 2.0 Auto Template |
| ATM | Adobe Type Manager data/info file |
| ATT | AT&T Group 4 bitmap |
| ATW | AnyTime Deluxe for Windows personal information manager file from Individual Software MultiModule screensaver |
| AU | Sun/NeXT/DEC/UNIX sound file |
| AU | Audio U-law (pronounced mu-law) |
| AUD | Audio file (Westwood Studios) (Kyrandia 3,C&C,RedAlert,C&C:TS) |
| AUP | Audacity project file |
| AUX | TeX/LaTeX Auxilliary Reference file |
| AUX | ChiWriter Auxilliary Dictionary file |
| AVA | Avagio Publication |
| AVG | AVG Virus Information Database |
| AVB | Inculan Anti-Virus virus infected file |
| AVI | Microsoft Audio Video Interleaved file for Windows movie |
| AVR | Audio Visual Research file |
| AVS | Application Visualization System file |
| AVS | Stardent AVS-X Image |
| AVX | File Extension (ArcView) |
| AW | HP AdvanceWrite Text file |
| AW | Applix Words file |
| AWD | FaxView Document image |
| AWE | Acrobat Bookmark XML File |
| AWK | AWK Script/Program |
| AWM | Animation Works Movie |
| AWR | Telsis file for digitally stored audio |
| AWS | StatGraphics Data file |
| AXL | ArcIMS XML project file |
| AXT | ASCII application object template (ZenWorks snAPPshot) |
| AXX | ARJ compressed file from a multi-volume archive (xx = a number from 01 to 99) |
| A3L | Authorware 3.x library |
| A4L | Authorware 4.x library |
| A5L | Authorware 5.x library |
| A3M | Authorware MacIntosh file (unpackaged) |
| A4M | Authorware MacIntosh file (unpackaged) |
| A4P | Authorware file (packaged without runtime) |
| A3W | Authorware Windows file (unpackaged) |
| A5W | Authorware Windows file (unpackaged) |
| B | Applause Batch list |
| BAD | Oracle bad file |
| BAK | Backup file |
| BAL | Ballade Music score |
| BAND | Garageband Project song |
| BAR | dBase Application Generator Horizontal menu object |
| BAS | BASIC source code |
| BAT | Batch file |
| BB | Papyrus Database backup |
| BBL | TeX/BibTeX Bibliographic reference file |
| BBM | Deluxe Paint Bitmap image |
| BBS | Bulletin Board Sytem text |
| BCH | Batch Process Object (dBase Application Generator) |
| BCH | Datalex Entry Point 90 Data file |
| BCM | Microsoft Works Communications file |
| BCO | Bitstream Outline font description file |
| BCP | Borland C++ Makefile |
| BCW | Borland C++ 4.5 Environment settings file |
| BDB | Microsoft Works Dababase file |
| BDF | West Point Bridge Designer file |
| BDF | Egret Datafile |
| BDR | Microsoft Publisher Border |
| BEZ | Bitstream Outline font description |
| BF2 | Bradford 2 Font |
| BFC | Windows 95 Briefcase Document |
| BFM | Font Metrics file (Unix/Mainframe) |
| BFX | Fax document file (BitFax) |
| BG | Microsoft Backgammon Game file |
| BGA | OS/2 Graphic array |
| BGI | Borland Graphics Interface Driver |
| BGL | Microsoft Flight Simulator Scenery file |
| BHF | pcAnywhere Host file |
| BI | Binary file |
| BIB | Bibliography file (ASCII) |
| BIB | TeX/BibTeX Literature Database |
| BIB | Database |
| BIF | GroupWise initialization file |
| BIF | Image Capture Board Binary Image black & white graphic |
| BIFF | XLITE 3D file |
| BIN | Binary file |
| BIO | OS/2 Bios file |
| BIT | X11 Bitmap |
| BK | Backup file (Generic) |
| BK | JetFax Faxbook file |
| BK$ | Backup file (Generic) |
| BK! | WordPerfect for Windows Document backup |
| BK1 | WordPerfect for Windows Timed backup file for document window 1 |
| BK2 | WordPerfect for Windows Timed backup file for document window 2 |
| BK3 | WordPerfect for Windows Timed backup file for document window 3 |
| BK4 | WordPerfect for Windows Timed backup file for document window 4 |
| BK5 | WordPerfect for Windows Timed backup file for document window 5 |
| BK6 | WordPerfect for Windows Timed backup file for document window 6 |
| BK7 | WordPerfect for Windows Timed backup file for document window 7 |
| BK8 | WordPerfect for Windows Timed backup file for document window 8 |
| BK9 | WordPerfect for Windows Timed backup file for document window 9 |
| BKP | TurboVidion Dialog Designer Backup |
| BKS | IBM BookManager Read bookshelf file |
| BKS | Microsoft Works Spreadsheet Backup |
| BKW | FontEdit Fontset mirror image |
| BLB | Resource archive (DreamWorks),(Neverhood) |
| BLD | BASIC Bloadable picture file |
| BLK | Alias Wavefront Image |
| BLK | WordPerfect for Windows Temporary file |
| BM | Windows system Bitmap |
| BMA | Song format used by Beatmania emulators |
| BMF | Binary Material File |
| BMF | Corel Gallery file |
| BMK | Windows Help bookmark |
| BMP | Windows or OS/2 bitmap |
| BM1 | Apogee BioMenace data |
| BN | Instrument bank file (AdLib) |
| BNK | Sound effects bank file (Electronic Arts) |
| BNK | Instrument Bank file (AdLib) |
| BOL | Compressed archive library file (Microsoft Booasm.arc) |
| BOM | Bill of materials file (Orcad Schematic Capture) |
| BOO | Microsoft Booasm.arc Compressed archive |
| BOOK | Adobe FrameMaker Book |
| BOX | Lotus Notes file |
| BPC | Business Plan Toolkit Chart |
| BPL | Borland Delphi 4 packed library |
| BPS | Microsoft Works Document |
| BPT | CorelDraw Bitmap fills file |
| BPX | Truevision Targa Bitmap |
| BQY | BrioQuery file |
| BR | Bridge Script |
| BRD | Eagle Layout file |
| BRK | Brooktrout Fax-Mail file |
| BR0 | PrintMaster graphics file |
| BRW | Application file associated with financial institution(s) loan applications |
| BRX | A file for browsing an index of multimedia options |
| BRZ | DbBRZ file for very large Db backup or restore |
| BSA | BSARC Compressed archive |
| BSC | Apple II Compressed archive |
| BSC | Fortran Pwbrmake Object |
| BSC | MS Developer Studio (MSDev) browser information |
| BSP | Quake map file |
| BS1 | Apogee Blake Stone data file |
| BS_ | Microsoft Bookshelf Find Menu shell extension |
| BTM | Batch file used by Norton Utilities |
| BTR | Database file (Btrieve 5.1) |
| BUD | Backup disk for Quicken |
| BUG | Bugs and Problems file |
| BUN | CakeWalk Audio Bundle (a MIDI program) |
| BUP | Backup |
| BUT | Buttons! Button definition |
| BUY | Movie data file |
| BV1 | WordPerfect for Windows Overflow file below insert point in document 1 |
| BV2 | WordPerfect for Windows Overflow file below insert point in document 2 |
| BV3 | WordPerfect for Windows Overflow file below insert point in document 3 |
| BV4 | WordPerfect for Windows Overflow file below insert point in document 4 |
| BV5 | WordPerfect for Windows Overflow file below insert point in document 5 |
| BV6 | WordPerfect for Windows Overflow file below insert point in document 6 |
| BV7 | Wordperfect for Windows Overflow file below insert point in document 7 |
| BV8 | WordPerfect for Windows Overflow file below insert point in document 8 |
| BV9 | WordPerfect for Windows Overflow file below insert point in document 9 |
| BW | SGI Black and White image file |
| BW | Silicon Graphics Raw red,green and blue bytes file |
| BWB | Visual Baler Spreadsheet application |
| BWR | Kermit Beware buglist |
| BWV | Business Wave file |
| BYU | BYU Movie |
| BZ | Bzip compressed file (Inix) |
| BZ2 | Bzip compressed file (Unix) (replaces Bz) |
| B1N | 1st Reader Mono and color binary screen image |
| B30 | ABC Ventura publisher printer font |
| B4 | Helix Nuts and Bolts file |
| B8 | Raw graphic file (Piclab Plane II) |
| B_W | Atari/Macintosh black and white graphic |
| B&W | Atari/Macintosh black and white graphic |
| B&W | 1st Reader Mono binary screen image |
| C | C code |
| C | Site configuration for Secure Remote (CheckPoint VPN) |
| CA | Telnet Server Initial cache data file |
| CAB | Microsoft cabinet file (program files compressed for software distribution) |
| CAC | dBase IV Executable file |
| CAD | Softdesk Drafix Cad file |
| CAG | Catalog file (Microsoft Clip Gallery v. 2.x,3.x,4.x) |
| CAL | CALS Compressed Bitmap |
| CAL | SuperCalc 4/5 Spreadsheet |
| CAL | Calendar schedule data file |
| CAM | Casio camera file |
| CAN | Navigator Fax |
| CAP | Ventura Publisher Caption |
| CAP | Compressed music file |
| CAP | Telix Session Capture file |
| CAR | AtHome assistant file |
| CAS | Comma-delimited ASCII file |
| CAT | Quicken IntelliCharge categorization file |
| CAT | dBase Catalogue file |
| CB | Microsoft clean boot file |
| CBC | CubiCalc Fuzzy Logic System file |
| CBF | Vietcong (game) Pterodon big file |
| CBI | Column binary file (used in IBM mainframe systems) |
| CBL | Cobol Source code |
| CBM | XLib Compiled Bitmap |
| CBR | Comic book or paperback RAR file (decompress with RAR utility) |
| CBT | Generic Computer based training file |
| CBZ | Comic book or paperback ZIP file (decompress with WinZip or similar program) |
| CC | Visual dBASE custom class file |
| CC | C++ Source code |
| CC3 | Close Combat 3 file |
| CCA | cc:mail archive file |
| CCB | Visual Basic Animated Button configuration file |
| CCC | Curtain Call Native bitmap graphic |
| CCD | Elaborate Bytes Clone CD mapfile for creating and reading .img files |
| CCE | Data file (Calendar Creator Plus) |
| CCF | Multimedia Viewer configuration file used in OS/2 |
| CCF | Symphony Communications Configuration file |
| CCH | Corel Chart |
| CCL | Intalk Communication Command Language |
| CCM | Lotus CC:Mail "box" file (for example, INBOX.CCM) |
| CCO | CyberChat data file |
| CCO | XBTX Graphics |
| CCT | Macromedia Director Shockwave cast file |
| CDA | CD Audio Track |
| CDB | Clipboard file |
| CDB | CardScan Database (CardScan) |
| CDB | TCU Turbo C Utilities Main database |
| CDB | Conceptual model backup file (PowerDesigner) |
| CDF | Netcdf Graphic file |
| CDF | Microsoft Channel Definition Format |
| CDFS | Compact Disk filing system (WindRiver) |
| CDI | Phillips Compact Disk Interactive file |
| CDK | Atari Calamus Document |
| CDM | Conceptual model file (PowerDesigner) |
| CDM | Visual dBASE custom data module |
| CDM | Conceptual data model file (PowerDesigner Data Architect) (Sybase) |
| CDR | Corel Draw Vector drawing file |
| CDR | Raw Audio-CD data file |
| CDR | Corel Vector Graphic Drawing File |
| CDT | Corel Draw template |
| CDT | CorelDraw Data file |
| CDX | Corel Draw compressed drawing |
| CDX | Microsoft's Visual Foxpro index |
| CE | The FarSide Computer Calendar Main CE file |
| CEF | Cruzer encrypted file (used to secure files on Cruzer USB flash drives) |
| CEG | Tempra Show Bitmap graphic |
| CEL | CIMFast Event Language file |
| CEL | AutoDesk Animator Cel Image |
| CER | Certificate file (MIME x-x509-ca-cert) |
| CEX | Caddie Exchange file |
| CF | Imake Configurtion file |
| CFB | Comptons Multimedia file |
| CFG | Configuration file |
| CFL | CorelFLOW Chart |
| CFM | ColdFusion template |
| CFM | Visual dBASE Windows customer form |
| CFM | Corel FontMaster file |
| CFN | Atari Calamus Font data file |
| CFO | TCU Turbo C Utilities C form object |
| CFP | The Complete Fax Portable fax file |
| CGA | Ventura Publisher Display font file |
| CGI | Common gateway interface script |
| CGM | Computer Graphic Metafile |
| CH | OS/2 configuration file |
| CH | Clipper 5 Header |
| CH3 | Harvard Graphics 3.0 Chart |
| CH4 | Charisma 4.0 Presentation |
| CHD | FontChameleon Font descriptor |
| CHF | pcAnywhere remote control file |
| CHI | ChiWriter Document |
| CHK | File fragments saved by Windows Disk Defragmenter or ScanDisk |
| CHK | WordPerfect for Windows Temporary file |
| CHL | Configuration History Log |
| CHM | Compiled HTML file |
| CHN | Ethnograph Data file |
| CHP | Ventura Publisher Chapter file |
| CHR | Character Sets (Font file) |
| CHT | ChartViewer file |
| CHT | Harvard Graphics Vector file |
| CHT | ChartMaster dBase Interface file |
| CIF | CalTech Intermediate Graphic |
| CIF | Easy CD Creator image |
| CIF | pcAnywhere caller file |
| CIL | Clip Gallery download package file |
| CIM | Sim City 2000 file |
| CIN | OS/2 change control file that tracks changes to an INI file |
| CIX | TCU Turbo C Utilities Database Index |
| CK1 | iD/Apogee Commander Keen 1 data |
| CK2 | iD/Apogee Commander Keen 2 data |
| CK3 | iD/Apogee Commander Keen 3 data |
| CK4 | iD/Apogee Commander Keen 4 data |
| CK5 | iD/Apogee Commander Keen 5 data |
| CK6 | iD/Apogee Commander Keen 6 data |
| CKB | Borland C++ Keyboard mapping file |
| CKF | Casio Keyboard File |
| CL | Generic LISP Source code |
| CL3 | Layout file (Adaptec Easy CD Creator) |
| CLASS | Java class |
| CLC | TI-83 Plus Flash Debugger file |
| CLG | Disk Catalog database |
| CLL | Cricket Software Clicker File |
| CLO | Cloe Image |
| CLP | Windows Clipboard |
| CLP | Quattro Pro Clip art |
| CLP | Clipper 5 Compiler Script |
| CLR | 1st Reader Binary color screen image |
| CLR | PhotStyler Color defintion |
| CLS | Visual Basic Class Module |
| CLS | C++ Class Definition |
| CLX | Adobe file |
| CLX | Macro ToolsWorks Macro file |
| CLX | Rational XDE file |
| CM | Craftman Data |
| CMA | Database file in plain text format (APPLIX TM1) |
| CMD | Command file for Windows NT (similar to a DOS .BAT file), OS/2 |
| CMD | DOS CP/M command file |
| CMD | dBase-II program file |
| CMD | 1st Reader External Command Menu |
| CMF | Corel Metafile |
| CFM | Creative FM-Music |
| CMG | Chessmaster saved game |
| CMK | Card Shop Plus file |
| CMM | CEnvi Batch file |
| CMP | JPEG Bitmap |
| CMP | Address document |
| CMP | CorelDRAW 4.0 Postscript Printer Header |
| CMP | Route 66 Address Document |
| CMP | Microsoft Word for DOS User dictionary |
| CMR | MediaPlayer Movie |
| CMV | Corel Move animation |
| CMX | Corel Presentation Exchange image |
| CMYK | Raw cyan, magenta, yellow, and black bytes file |
| CNC | CNC General Program data |
| CNF | Configuration file used by Telnet, Windows, and other applications with varying internal formats |
| CNM | Windows application menu options and setup file |
| CNQ | Compuworks Design Shop file |
| CNT | Windows (or other) system content files for the help index and other purposes |
| CNV | Word for Windows Data conversion support file |
| CNV | WordPerfect for Windows Temporary file |
| CNV | Conversion files (WS_FTP Pro) files that will be converted from (Example) "HTML-"HTM" for upload |
| COB | trueSpace 2 object |
| COB | COBOL Source code |
| COD | Microsoft C compiler output as displayable machine language/assembler with original C as comments |
| COD | FORTRAN Compiled code |
| COD | dBase Application Generator Template source file |
| COD | Video Text file |
| COE | Xilinx coefficient |
| COL | AutoDesk Animator Color Palette |
| COL | Microsoft Multiplan Spreadsheet |
| COM | Command file (program) |
| CON | Simdir Configuration file |
| CP | CryptoPad.NET Encrypted document |
| CP8 | CP8 256 Gray Scale image |
| CPD | Corel PrintOffice file (drawing) |
| CPD | Fax Cover document |
| CPD | Complaints Desk Script |
| CPE | Fax Cover document |
| CPF | CORDIS CPF Editor Contract Preparation Form Submission File |
| CPF | The Complete Fax (Fax file) |
| CPH | Image file (Corel Print House) see CPO |
| CPI | Microsoft MS-DOS code page information |
| CPI | ColorLab Processed Image bitmap |
| CPJ | CeQuadrant CD Project |
| CPL | Control Panel Module |
| CPL | Compel Presentation |
| CPL | Corel color palette |
| CPM | Turbo Pascal DOS file |
| CPO | Image file (Corel Print Office) |
| CPP | C++ Source code |
| CPP | CA-Cricket Presents presentation |
| CPR | Corel Presents presentation |
| CPS | Central Point PC Tools Backup |
| CPS | Coloured postscript |
| CPT | Corel Photo-Paint image |
| CPT | Macintosh Compressed Archive |
| CPT | dBase Encrypted Memo |
| CPT | CA-Cricket Presents Template |
| CPX | Corel Presentation Exchange compressed drawing |
| CPY | Data file (Copy Books) |
| CPZ | COMPOZ Music Text |
| CRC | Circular reference file (Pro/Engineer) |
| CRC | Check file (Win-SFV32)(Fantasia Software) |
| CRD | Microsoft Windows 3.x Cardfile |
| CRF | Zortech C++ cross-reference |
| CRH | Image file (Microsoft Golf) |
| CRP | Corel Presents run-time presentation |
| CRP | Visual dBASE custom report |
| CRP | dBase IV Encrypted database |
| CRS | WordPerfect 5.1 for Windows File Conversion resource |
| CRT | Certificate file |
| CRT | Oracle Terminal settings information |
| CRT | Crontab file) |
| CRU | CRUSH Compressed archive |
| CS1 | Sinar CaptureShop raw file for Macintosh |
| CS4 | Sinar CaptureShop raw file for Macintosh |
| CS16 | Sinar CaptureShop raw file for Macintosh |
| CSA | Comma deliminated text |
| CSC | Corel script |
| CSG | Statistica/w Graph file |
| CSH | C shell script files (Hamilton Labs) |
| CSM | Borland C++ 4.5 Precompiled header |
| CSM | Script file (Kodak Dc265 Camera) |
| CSO | Customer service data and outcome file |
| CSP | PC Emcee On-Screen image |
| CSS | Stats+ Datafile |
| CSS | Statistica/w Datasheet |
| CSS | vCascading Style Sheet (MIME) |
| CST | Macromedia Director "Cast" (resource) file |
| CSV | Comma-separated values file |
| CSV | CompuShow Adjusted EGA/VGA Palette |
| CT | Scitex CT bitmap |
| CT | A graphic file associated with the Paint Shop Pro Graphic Editor |
| CTB | AutoCAD Color-dependent Plot Style Table |
| CTC | PC Installer Control |
| CTF | Symphony Character code translation |
| CTL | Used in general for files containing control information. FAXWorks uses it to keep information about each fax sent and received. |
| CTL | dBase IV Control |
| CTX | Visual Basic User control binary file |
| CTX | Pretty Good Privacy (PGP) Ciphertext file |
| CTX | Microsoft Online Course Text |
| CUE | ALCATech BPM Studio Cue Points |
| CUE | CDRWin (and others) Description File for a CD-Image |
| CUE | Microsoft Cue Cards Data |
| CUL | Cursor library file (IconForge) |
| CUR | Windows Cursor |
| CURSOR | Sun Microsystems Cursor |
| CUT | Dr Halo Bitmap |
| CV | Corel Versions archive |
| CV | Microsoft CodeView information screen |
| CVG | Image |
| CVS | Canvas drawing file |
| CWK | Claris Works data |
| CWS | Claris Works template |
| CXT | Macromedia Director protected (not editable) "Cast" (resource) file |
| CXX | C++ source code |
| CZIP | Encrypted Zip File |
| C-- | Sphinx C-- Source code |
| C00 | Ventura Publisher Print file |
| C01 | Typhoon wave |
| C86 | Computer Innovation (C86) Source code |
| DAA | PowerISO Direct-Access-Archive |
| DAO | Windows Registry Backup |
| DAP | Data access page (Microsoft Access 2000) |
| DAR | DVD Architect File |
| DAT | Data file |
| DAT | A data file extension used to designate an error message in a inbound internet email message (Microsoft Exchange Server v 5.0) |
| DAT | WordPerfect Merge Data |
| DAT | Extension used for some MPEG files |
| DAT | Yahoo Messenger archive file |
| DB | Borderland's Paradox 7 table database |
| DBC | Microsoft's Visual FoxPro database container file |
| DBF | A dBASE file, a format originated by Ashton-Tate, but understood by Act!, Clipper,FoxPro, Arago, Wordtech, xBase, and similar database or database-related products. |
| DBF | Enable database (can be opened with Excel 97) |
| DBF | Oracle 8.1.x tablespace file |
| DBK | dBase Database Backup |
| DBK | Schematic backup file (Orcad Schematic Capture) |
| DBO | Compiled program file (dBase IV) |
| DBQ | Paradox Memo |
| DBS | Managing Your Money data file |
| DBS | Microsoft Word printer description file |
| DBS | PRODAS data file |
| DBS | SQL Windows database |
| DBT | dBase Text Memo |
| DBV | Memo field file (Flexfile 2) |
| DBW | Microsoft Windows 9.x Database file (DataBoss) |
| DBX | DataBeam image |
| DBX | Outlook Express mail folder |
| DBX | Microsoft's Visual FoxPro Table file |
| DC | CAD file (DesignCAD) |
| DC2 | CAD file (DesignCAD) |
| DCA | Document Content Architecture Text file (IBM DisplayWrite) |
| DCA | Visual Basic Active designer cache |
| DCF | Disk Image file |
| DCF | Data file (Dyadic) |
| DCL | AutoCAD Dialog Control Language Description file |
| DCIM | Digital Imaging and Communications in Medicine (image and data) |
| DCM | DCM module |
| DCP | Data CodePage (OS/2) |
| DCR | Shockwave file |
| DCS | Desktop Color Separation file |
| DCS | Bitmap Graphics (Quark XPress) |
| DCS | Datafile (ACT! Activity file) |
| DCT | Microsoft's Visual FoxPro database container file |
| DCT | Database Dictionary file (Clarion Database Developer) |
| DCT | Database SpellCheck Dictionary (Harvard Graphics 3.0-Symphony) |
| DCU | Delphi compiled unit |
| DCX | Microsoft's Visual FoxPro database container file |
| DCX | Fax image (based on PCX) |
| DCX | Macro file |
| DCX | Bitmap Graphics file (Multipage PCX) |
| DC5 | DataCAD Drawing |
| DD | Compressed Archive (Macintosh DISKDOUBLER) |
| DDB | Bitmap Graphics file |
| DDF | Btrieve or Xtrieve Data Definition File, which contains metadata describing a Btrieve or Xtrieve file |
| DDI | Image File (DISKDUPE) |
| DDIF | Digital Equipment or Compaq file. Used for storing images and their word processing documents |
| DDP | Device Driver Profile (OS/2) |
| DEB | Debug Script (DOS Debug) |
| DEF | SmartWare II data |
| DEF | Define Module file (3-D Fassade Plus) |
| DEF | C++ definition file |
| DEF | Assembly Header file (Geoworks) |
| DEFI | Oracle 7 de-install script |
| DEM | Demo file (Descent) |
| DEM | A file with USGS standards for Digital Elevation Models (Vista Pro) |
| DEM | Graphics file (Vista Pro) |
| DEP | Visual Basic Setup Wizard Dependency file |
| DER | Certificate file |
| DEV | Device Driver |
| DEWF | Macintosh SoundCap/SoundEdit recorded instrument file |
| DEZ | Encrypted zip file (DES Encryption) |
| DFD | Data Flow Diagram Graphic (Prosa) |
| DFI | Outline Font description (Digifont) |
| DFL | Default Program Settings (Signature) |
| DFM | Data Flow Diagram model (Prosa) |
| DFS | Sound File (Delight) |
| DFV | Printing Form value (Microsoft Word) |
| DGN | Bentley Systems drawing file |
| DGN | Microstation95 CAD drawing |
| DGS | Diagnostics Report |
| DH | Dependency Information file (Geoworks) |
| DHP | Graphic file (Dr. Halo II-III PIC Format) |
| DHT | Datafile (Gauss) |
| DHS | Shadowgrounds Savegame File |
| DIA | Diagraph Graphics file (Computer Support Corporation) |
| DIB | Device-independent bitmap |
| DIC | Dictionary file |
| DIC | Dictionary file (Lotus Notes, Domino) |
| DICM | Digital imaging and communications in medicine file (DICOM) |
| DIF | Data Interchange Format spreadsheet |
| DIF | Database file (VisiCalc) |
| DIF | Data Interchange Output file |
| DIF | Text file (Output from Data Interchange Format) |
| DIG | Digilink file |
| DIG | Sound Designer I audio |
| DIP | Graphics file |
| DIR | Macromedia Director file |
| DIR | Dialing Directory (ProComm Plus) |
| DIR | Directory (VAX) (DEC) |
| DIR | Movie (MacroMind Director 4.x) |
| DIS | Ray Tracer file |
| DIS | Distribution file (VAX Mail) |
| DIS | Thesaurus file (CorelDraw) |
| DIZ | Description file (Description in ZIP) |
| DJS | Data Junction Integration map |
| DJS | NASCAR Thunder game music file |
| DJVU | DjVu compressed image file |
| DKB | Graphics file (Ray Traced DKBTrace) |
| DL | Image |
| DLD | Datafile (Lotus 1-2-3) |
| DLG | C++ Dialogue Script |
| DLL | Dynamic-link library file |
| DLL | Export/Import Filter (CorelDraw) |
| DLS | Downloadable sound |
| DLS | Interactive music architecture (IMA)(Microsoft),(Blood2) |
| DLS | Setup file (Norton DiskLock) |
| DMD | Visual dBASE data module |
| DMF | Packed Amiga disk image |
| DMF | X-Trakker music module (MOD) |
| DMG | Macintosh disk image file (copy of contents of a hard disk or CD) |
| DMO | Demo file (Derive) |
| DMP | Dump file (Screen or Memory) |
| DMS | Compressed Archive (Amiga DISKMASHER) |
| DOB | Visual Basic User document |
| DOC | FrameMaker or FrameBuilder document |
| DOC | WordStar document |
| DOC | WordPerfect document |
| DOC | Microsoft Word document |
| DOC | DisplayWrite document |
| DOC | Document format (Interleaf) |
| DOG | Screen Saver file (Laughing Dog Screen Saver) |
| DOH | Dependency Information file (Geoworks) |
| DOS | External Command file (1st Reader) |
| DOS | Network Driver file (PKT_DIS.dos) |
| DOS | Text file (DOS) |
| DOT | Word Document Template (Microsoft Word for Windows) |
| DOT | Line-Type definition (CorelDraw) |
| DOX | User document binary form (Visual Basic) |
| DOX | Text file (MultiMate 4.x) |
| DOZ | Description out of Zip (VENDINFO) |
| DP | Calendar file (Daily Planner) |
| DP | Datafile (DataPhile) |
| DPL | Borland Delphi 3 packed library |
| DPR | Project header (Borland C++) |
| DPT | Publication file (Publish-It!) |
| DRA | Dragon NaturallySpeaking file |
| DRAW | Acorn's object-based vector image |
| DRC | Design rules check report file (Orcad Schematic Capture) |
| DRG | AllyCAD file |
| DRG | Motion Software Dyno2000 Car Design |
| DRG | VLBI and Tied Array Drudge Tasking Document |
| DRS | Display Resource file (WordPerfect for Windows) |
| DRV | Driver |
| DRV | Device Driver (Required to make a device function) |
| DRW | Caddie CAD drawing |
| DRW | Lotus Freelance image |
| DRW | Micrografx vector graphics file |
| DRW | Pro/E drawing |
| DS4 | Micrografx Designer Image |
| DR9 | Directory file |
| DS4 | Vector Graphics (Micrografx) |
| DSC | Discard file (Oracle) |
| DSD | Database file (DataShaper) |
| DSF | Micrografx Designer v7.x file |
| DSG | DooM saved game |
| DSK | Project Desktop file (Borland C++/Turbo Pascal) |
| DSK | Driver file (Novell Netware) |
| DSM | Dynamic Studio music module (MOD) |
| DSM | Digital Sound Module (DSI) |
| DSM | Music module file (DSIK) |
| DSN | ODBC Data source |
| DSN | Design (Object System Designer) |
| DSN | Schematic file (Orcad Schematic Capture) |
| DSP | Microsoft Developer Studio project |
| DSP | Display parameters (Signature) |
| DSP | Graphics Display driver Dr. Halo) |
| DSQ | Corel QUERY |
| DSR | Visual Basic Active designer file |
| DSR | Driver Resource (WordPerfect for Windows) |
| DSS | Screensaver file (DCC) |
| DSS | Digital Sound file (Digital Soup)) |
| DST | Embroidery machines graphic file |
| DST | Distribution file (PC-RDist, by Pyzzo) |
| DSW | Desktop settings (Borland C++ 4.5) |
| DSW | Microsoft Developer Studio workspace file |
| DSX | Visual Basic Active designer binary file |
| DT_ | Data file fork (Macintosh) |
| DTA | World Bank's STARS data |
| DTA | Datafile (Turbo C++) |
| DTD | SGML Document Type Definition (DTD) file |
| DTED | Digital terrain elevation data (geographic data format) |
| DTF | Database file (PFS-Questions & Answers) |
| DTF | Symantec Q&A relational database |
| DTM | Module file (DigiTrakker) |
| DTP | Desktop layout file (SecurDesk!/SecurDesk! LV) |
| DTP | Text Document (Timeworks Publisher 3.x) |
| DTP | Template file (Pressworks) |
| DUN | Microsoft Dial-up Networking Export file |
| DUP | Duplicate Backup |
| DUS | Readiris font dictionary |
| DV | Digital video (MIME) |
| DVC | Datafile (Lotus 1-2-3) |
| DVF | Graphics file associated with camcorders (DV Studio) |
| DVI | Binary file (TeX) |
| DVI | Device Independent Document (TeX) (LaTeX) |
| DVP | Desqview Program information (DESQview) |
| DVP | Device parameter file (AutoCAD) |
| DW2 | Drawing file (DesignCAD for Windows) |
| DWC | Compressed Archive (DWC) |
| DWD | DiamondWare digitized file |
| DWF | Vector graphic (Autodesk) |
| DWF | Drawing Web file (Microsoft WHIP autoCAD reader) |
| DWG | AutoCAD Drawing |
| DWG | AutoCAD drawing, or older Generic CAD drawing file |
| DWH | Express Tools log file |
| DWI | Stepfile format for Dance Dance Revolution simulator |
| DWP | Document file (DeScribe) |
| DWS | Workspace file (Dyadic) |
| DX | Digital Electric Corporation (DEC) Data exchange file |
| DXB | AutoCAD Drawing Exchange Format file |
| DXF | Drawing Interchange (eXchange) format,a text representation of the binary DWG format |
| DXF | Drawing Interchange Format (AutoCAD) |
| DXF | Data Exchange File |
| DXN | Fax document (Fujitsu dexNet) |
| DXR | Macromedia Director protected (not editable) movie file |
| DYN | Datafile (Lotus 1-2-3) |
| D2D | 2D/3D object file (3-D Fassade Plus) |
| D64 | Commodore 64 emulator disk image |
| e00 | Exchange file (Arc/Info) |
| EASM | SolidWorks eDrawing Electronic Assembly Data File |
| EBJ | Error Checking Object file (Geoworks) |
| ECW | RASTER structured graphics |
| ECW | VECTOR structured graphics files |
| ED5 | EDMICS image |
| ED6 | EDMICS image |
| EDA | Ensoniq ASR disk image |
| EDB | ROOTS3 Geneological data file |
| EDE | Ensoniq EPS disk image |
| EDD | Element Definition document (FrameMaker+SGML documents) |
| EDK | Ensoniq KT disk image |
| EDQ | Ensoniq SQ1/SQ2/KS32 disk image |
| EDS | Ensoniq SQ80 disk image |
| EDT | Default settings (VAX Edt editor) |
| EDV | Ensoniq VFX-SD disk image |
| EEB | Button Bar for Equation editor (WordPerfect for Windows) |
| EFA | Ensoniq ASR file |
| EFE | Ensoniq EPS file |
| EFK | Ensoniq KT file |
| EFQ | Ensoniq SQ1/SQ2/KS32 file |
| EFS | Ensoniq SQ80 file |
| EFT | High Resolution Screen Font (ChiWriter) |
| EFV | Ensoniq VFX-SD file |
| EFX | Fax Document (Everex EFax) |
| EFX | Fax document (Efax Reader) |
| EGA | EGA Display font (Ventura Publisher) |
| EGM | Bentley Systems drawing file |
| EL | Lisp Source code (eMacs) |
| ELC | eMac Lisp Source code (byte-compiled) |
| ELM | Theme-Pack file for (Microsoft FrontPage) |
| ELT | Event List Text file (Prosa) |
| EMAIL | Microsoft Outlook Express mail message (save to desktop, scan for viruses, then convert to an EML file before opening) |
| EMB | Embedded bank File (Everest) |
| EMD | ABT Extended MoDule |
| EMF | Enhanced Windows Metafile |
| EML | Microsoft Outlook Express mail message (MIME RFC 822) |
| EMS | Enhanced Menu System Configuration file (PC Tools) |
| EMU | Terminal Emulation Data file (BITCOM) |
| EMZ | Windows Compressed Enhanced Metafile, a graphic format used in Office and Visio |
| ENC | Music file (Encore) |
| ENC | Video file |
| ENC | Encoded file (UUENCODEd File, Lotus 1-2-3) |
| END | Arrow-Head Definition Table (CorelDraw) |
| ENFF | Neutral Format |
| ENG | Dictionary Engine file (Sprint) |
| ENG | Chart Graphics file (EnerGraphics) |
| ENV | Enveloper Macro (WOPR) |
| ENV | Environment file (WordPerfect for Windows) |
| EPD | Publication file (Express Publisher) |
| EPHTML | Enhanced Perl-parsed HTML |
| EPI | Document file (Express Publisher) |
| EPRT | SolidWorkseDrawing CAD file |
| EPS | Encapsulated Postscript Vector graphics (Adobe Illustrator) |
| EPS | Printer font (Epson, Xerox, Ventura Publisher) |
| EPS2 | Adobe Level II Encapsulated Postscript |
| EPS | Encapsulated Postscript image file |
| EPSF | Encapsulated PostScript |
| EPSI | Adobe Encapsulated Postscript Interchange |
| EQN | Equation file (WordPerfect for Windows) |
| ER1 | ERWin file |
| ERD | Entity Relationship Diagram graphic file (Prosa) |
| ERM | Entity Relationship Diagram Model file (Prosa) |
| ERR | Stores the error messages that result when the RoboHELP Help Compiler attempts to compile the source files of a Help system |
| ERR | Compilation error file (Microsoft Visual FoxPro) |
| ERX | ERWin file |
| ESH | Extended Shell Batch file (DOS) |
| ESL | Distributable support library file (Microsoft Visual FoxPro) |
| ESPS | ESPS audio file |
| EST | Interactive Cost Estimating 2000 file |
| EST | Microsoft Streets & Trips Trip File |
| ESU | ESRI Single Use License Information file |
| ET | EasiTeach document |
| ETH | Document file (Ethnograph 3.x) |
| ETX | Structure Enhanced text (SetText) |
| EUI | Ensoniq ESP family compacted disk image |
| EVT | Event Log (Microsoft Windows NT, 2000) |
| EVY | Document (WordPerfect for Windows Envoy) |
| EWD | Text Document (Express Publisher for Windows) |
| EWL | Microsoft Encarta document |
| EXT2 | Second extended file system (Linux) |
| EXT3 | Third extended file system (Linux) |
| EX3 | Device Driver file (Harvard Graphics 3.x) |
| EXC | Microsoft Word Exclusion Dictionary file |
| EXC | Source Code file (Rexx VM/CMS) |
| EXC | Exclude file for Optimize (do not process, QEMM) |
| EXE | Executable file (program) |
| EXP | Saved chat (ICQ) |
| EXT | ASCII binary transfer file (WS_FTP PRO) (IPSWITCH Software) |
| EZP | Compressed file (Edify.zip) (Edify Electronic Workforce Backup Utility) |
| E00 | Coverage export file (ArcInfo) |
| F | FORTRAN file |
| F | Compressed file archive (FREEZE) |
| FAC | Face graphic |
| FAQ | Frequently Asked Questions document |
| FAR | Music module (MOD) (Farandole Composer) |
| FAS | AutoCAD Fastload Auto LISP file |
| FAS | Basic module file (3-D Fassade Plus) |
| FAV | Navigation bar (Microsoft Outlook) |
| FAX | FAX Type image |
| FBK | Backup (Navison Financials) |
| FC | Spell Check dictionary file (Harvard Graphics) |
| FCD | Virtual CD-ROM file |
| FCM | Binary file patch (Forward Compression) |
| FD | Declaration file (FORTRAN) |
| FD | Field offsets for compiler (DataFlex) |
| FDB | Database (Navison Financials) |
| FDF | Forms Document (Adobe Acrobat) |
| FDW | Document form (F3 Design and Mapping) |
| FEB | Button Bar for Figure Editor (WordPerfect for Windows) |
| FEM | CADRE Finite Element Mesh |
| FES | Topicscape file for fileless exports to Windows |
| FF | Outline Font description (AGFA CompuGraphics) |
| FFA | MS find fast file |
| FFF | Fax document (defFax) |
| FFF | GUS PnP bank file |
| FFL | MS fast find file |
| FFL | Image file (PrintMaster Gold) |
| FFO | MS fast find file |
| FFT | Final Form Text (part of IBM's DCA) |
| FFX | MS fast find file |
| FH3 | Aldus Freehand 3 drawing (Vector graphic) |
| FH4 | Aldus Freehand 4 drawing (Vector graphic) |
| FH9 | Macromedia Freehand 9 graphic file |
| FI | File Interface (FORTRAN) |
| FIF | Fractal Image |
| FIG | REND386/AVRIL file |
| FIL | File template (Application Generator) |
| FIL | File List Object (dBase Application Generator) |
| FIL | Overlay (WordPerfect for Windows) |
| FILE | AS/400 physical file |
| FIN | Print formatted text (Perfect Writer) |
| FIT | Graphic (FITS) |
| FIT | File index table (Microsoft Windows NT) |
| FITS | CCD camera image |
| FITS | Flexible Image Transport System file |
| FIX | Patch file (Generic) |
| FKY | Macro (Microsoft FoxPro) |
| FLA | Movie (Macromedia Flash) |
| FLAC | Free Lossless Audio Compression file |
| FLB | Format library (Papyrus) |
| FLC | FLIC animation (AutoDesk) |
| FLD | File folder (Charisma) |
| FLD | Field define module file (3-D Fassade Plus) |
| FLF | Delived form (Corel Paradox) |
| FLF | License (Navison Financials) |
| FLI | FLIC animation (AutoDesk) |
| FLI | Font library (EmTeX) |
| FLF | Driver (OS/2) |
| FLL | Distributable dynamic link library (DLL) (Microsoft Visual FoxPro) |
| FLM | Film Roll (AutoCAD) |
| FLO | FlowCharter file (MicroGrafx) |
| FLP | Corel Flow Project Flow Chart |
| FLP | Family Lawyer Saved Document |
| FLP | FlipAlbum File |
| FLP | Floppy Disk Image File |
| FLP | Fractal Explorer Fractal Landscape Project |
| FLP | GIFLine V1.0 |
| FLP | Promethean ACTIVboard file |
| FLS | Filelist document (Farrukh Imposition Publisher) |
| FLT | Graphics filter (Microsoft) |
| FLT | Filter (Corel) |
| FLT | Filter (Micrografx Picture Publisher) |
| FLT | Graphics filter support file (Asymetrix ToolBook) |
| FLT | Music module (MOD) (StarTrekker) |
| FLT | Open Flight file (MulitGen) |
| FLV | Macromedia Flash Video file |
| FLW | Kivio flowchart file |
| FLX | Compiled binary file (DataFlex) |
| FM | Spreadsheet (FileMaker Pro) |
| FM | FrameMaker Document (Adobe) |
| FM1 | Spreadsheet (Lotus 1-2-3, version 2.x) |
| FM3 | Device driver (Harvard Graphics, version 3.0) |
| FM3 | Spreadsheet (Lotus 1-2-3, version 3.x) |
| FMB | Binary source code for form, (Oracle, v4.x and later) |
| FMB | File Manager button bar (WordPerfect for Windows) |
| FMF | Font or Icon (IBM LinkWay) |
| FMK | MakeFile (FORTRAN PowerStation) |
| FML | Mirror list (Oracle) |
| FMO | Compiled format (dBase IV) |
| FMP | Document file (FileMaker Pro) |
| FMT | Text format for form file (Oracle, v4.x and later) |
| FMT | Print file (Microsoft Schedule+) |
| FMT | Style sheet (Sprint) |
| FMT | Csreen format file (Microsoft Visual FoxPro) |
| FMX | Executable form, (Oracle,v4.x and later) |
| FN3 | Font (Harvard Graphics) |
| FNC | Functions file in a neural network application |
| FNC | Fixed neighbors constraint file in RMC++ application |
| FND | Saved Search (Find applet) (Microsoft Explorer) |
| FNG | Font group (Font Navigator) |
| FNK | Module (FunkTracker) |
| FNT | Font (Generic) |
| FNX | Inactive font (Exact) |
| FO1 | Font (Borland Turbo C) |
| FO2 | Font (Borland Turbo C) |
| FOG | Fontographer font |
| FOL | Saved message folder (1st Reader) |
| FON | Font (Generic) |
| FON | Call log (Procomm Plus) |
| FON | System font (Generic) |
| FON | Dialing directory (Telix) |
| FOR | FORTRAN source code |
| FOR | Form (WindowBase) |
| FOT | Font-related file (Generic) |
| FOT | Installed TrueType font (Microsoft Windows Font Installer) |
| FP | Configuration file (FoxPro) |
| FP | FileMaker Pro file |
| FP1 | Flying Pigs screensaver datafile (Microsoft Windows 9.x) |
| FP3 | FileMaker Pro v.3 & 4 document file |
| FP5 | Document file (FileMaker Pro v.5) |
| FPC | Catalog file (FoxPro) |
| FPT | FileMaker Pro file |
| FPT | Memo fields (Microsoft FoxPro) |
| FPW | Floorplan drawing (FloorPlan Plus for Windows) |
| FPX | Bitmap (FlashPix) |
| FR3 | Renamed dBaseIII+ form (dBase IV) |
| FRF | Font (FontMonger) |
| FRG | Uncompiled report (dBase IV) |
| FRK | Zip (compressed ) file (Macintosh) |
| FRM | Form (Generic) |
| FRM | Document (FrameMaker or FrameBuilder) |
| FRM | Executable file (Oracle,v3.0 and earlier) |
| FRM | Form (Visual Basic) |
| FRM | Merge form (WordPerfect for Windows) |
| FRM | Symbol Report (DataCAD) |
| FRO | Compiled report (dBase IV) |
| FRP | Form (PerForm PRO Plus) |
| FRS | Screen Font Resource (WordPerfect for Windows) |
| FRT | Report menu (FoxPro) |
| FRX | Form stash file (Visual Basic) |
| FRX | Report (Microsoft FoxPro) |
| FSF | fPrint Audit Tool |
| FSL | Paradox 7 form (Borderland) |
| FSL | Form (Paradox for Windows) |
| FSL | Saved form (Corel Paradox) |
| FSM | Sample file (Farandoyle) |
| FST | Linkable program (dBFast) |
| FSX | Data (Lotus 1-2-3) |
| FT | Full text index (Lotus Notes) |
| FTB | Index file (Roots3) |
| FTF | Client access data specification file (AS/400) (Client to Server) |
| FTG | Help system full-text search group file (Microsoft Windows) |
| FTM | Font (MicroGrafx) |
| FTP | File transfer protocol (Internet Generic) |
| FTS | Help system full-text search index (Windows) |
| FTW | Document file (Family Tree Maker) |
| FW | Database (Framework II) |
| FW2 | Database (Framework II) |
| FW3 | Database (Framework III) |
| FW4 | Database (Framework IV) |
| FWB | Data file backup for file splitting configuration (FileWrangler) |
| FWP | Microsoft FrontPage Web package (archive format for Web site content) |
| FWS | Data file for file splitting configuration (FileWrangler) |
| FX | On-Line guide (FastLynx) |
| FXD | Phonebook (FAXit) |
| FXP | Compiled source code (FoxPro) |
| FXS | Fax Transmit graphic (WinFax) |
| FZB | Bank dump file (Casio FZ-1) |
| FZF | Full dump file (Casio FZ-1) |
| FZV | Voice dump file (Casio FZ-1) |
| F01 | Fax document (Perfect Fax) |
| F06 | Dos screen text font (height= 6 pixels) |
| F07 | Dos screen text font (height= 7 pixels) |
| F08 | Dos screen text font (height= 8 pixels) |
| F09 | Dos screen text font (height= 9 pixels) |
| F10 | Dos screen text font (height= 10 pixels) |
| F11 | Dos screen text font (height= 11 pixels) |
| F12 | Dos screen text font (height= 12 pixels) |
| F13 | Dos screen text font (height= 13 pixels) |
| F14 | Dos screen text font (height= 14 pixels) |
| F15 | Dos screen text font (height= 15 pixels) |
| F16 | Dos screen text font (height= 16 pixels) |
| F2R | Linear music module (Farandole) |
| F3R | Blocked music module (Farandole) |
| F77 | Source code file (FORTRAN 77) |
| F90 | FORTRAN file |
| F96 | Fax document (Frecom FAX96) |
| G | Data chart (APPLAUSE) |
| GAL | Album (Corel Multimedia Manager) |
| GAM | Fax document (GammaFax) |
| GB | Emulator ROM image file (Nintendo GameBoy) |
| GBC | Color emulator ROM image file (Nintendo GameBoy) |
| GBL | Global definitions (VAXTPU Editor) |
| GC1 | Lisp source code (Golden Common Lisp 1.1) |
| GC3 | Lisp source code (Golden Common Lisp 1.1) |
| GCD | Generic (TM) CADD drawing (later versions) |
| GCP | Image processing file (Ground Control Point) |
| GDB | Database file (InterBase) |
| GDF | Dictionary file (GEOS) |
| GDM | Bells, whistles, and sound boards module |
| GED | Genealogical data (GEDCOM) |
| GED | Graphic Environment Document (drawing) |
| GED | Graphics editor native format (Arts & Letters) |
| GED | Graphics editor file (EnerGraphics) |
| GEM | Metafile (GEM) |
| GEM | Vector graphics (Ventura Publisher) |
| GEN | Generated text (Ventura Publisher) |
| GEN | Compiled template (dBase Application Generator) |
| GEO | Geode (Geoworks) |
| GetRight | Unfinished-Download (GetRight) |
| GFB | Compressed gif image (GIFBLAST) |
| GFC | Patton&Patton Flowcharting 4 flowchart |
| GFI | Graphics Link presentation (Genigraphics) |
| GFT | Font (NeoPaint) |
| GFX | Genigraphics Graphics Link presentation |
| GHO | Symantec ghost image file |
| GHS | Symantec ghost segment file (automatically spanning files over 2 GB in size) |
| GIB | Chart (Graph-in-the-Box) |
| GID | Windows 95 global index (containing help status) |
| GIF | Bitmap (CompuServe) |
| GIM | Graphics Link presentation (Genigraphics) |
| GIW | Presentation (Graph-in-the-Box for Windows) |
| GIX | Graphics Link presentation (Genigraphics) |
| GKH | Ensoniq EPS family disk image |
| GKS | GripKey document (Gravis) |
| GL | Animation file (GRASP graphical System for Presentation) |
| GBL | Global file |
| GBM | Genie Backup Manager file |
| GLB | Textured 3-D scene file format |
| GLB | Microsoft Exchange Server resynchronization file |
| GLM | Datafile (Glim) |
| GLS | Datafile (Across) |
| GLY | Glossary (Microsoft Word) |
| GMF | CGM Graphics (APPLAUSE) |
| GMP | Majesty Savegame File |
| GMP | Tile map (Geomorph) (SPX) |
| GMR | Graphical monitor record (Schlafhorst Automation) |
| GNA | Graphics Link presentation (Genigraphics) |
| GNO | Genealogy document file (Genopro) |
| GNT | Generated executable code (Micro Focus) |
| GNX | Graphics Link presentation (Genigraphics) |
| GOC | Goc sorce code (Geoworks) |
| GOH | Goc header (Geoworks) |
| GP | Geode parameter file (Geoworks Glue) |
| GP3 | Guitar Pro 3 file |
| GPH | Graph (Lotus 1-2-3/G) |
| GPK | Program package (Omnigo) |
| GPP | Graph paper application file (GraphPap) (Generates graph paper) |
| GR2 | Screen driver (Microsoft Windows 3.x) |
| GRA | Graph (Microsoft) |
| GRA | Datafile (SigmaPlot) |
| GRB | Shell Monitor (MS-DOS v5.0) |
| GRD | Image processing grid (CHIPS) |
| GRF | Grapher (Golden Software) graph |
| GRF | Graph (Charisma Graph Plus) |
| GRM | Minos File |
| GRM | VISUAL EPR Input Data for FIntGraf |
| GRP | Program Manager Group (Microsoft) |
| GRP | Pictures group (PixBase) |
| GRY | Raw graphic (GREY) |
| GS1 | Presentation (GraphShow) |
| GSD | Vector graphic (Professional Draw) |
| GSM | Audio stream Raw GSM (6.10 audio stream) |
| GSM | Audio stream Raw 'byte aligned (GSM 6.10 audio stream) |
| GSM | GSM w.o. header/VoiceGuide/RapidComm file (US Robotics voice modems) |
| GSM | GSM w. header/QuickLink file (US Robotics voice modems) |
| GSP | Sketch pad file (GeoMeter Sketch Pad) |
| GSP | Zip file (Gnuzip) (Allows for output to html) |
| GSW | Worksheet (GraphShow) |
| GTH | Lotus Domino document manager file |
| GTH | IBM Gatherer file |
| GTK | Music module (Graoumftracker) (old) (MOD) |
| GT2 | Music module (Graoumftracker) (new) (MOD) |
| GUP | Data (PopMail) |
| GVL | RCL Software Gravel (astronomy simulator) file |
| GVP | Google Video Pointer |
| GWI | Novell GroupWise file |
| GWP | Greetings WorkShop (now Microsoft Picture It) file |
| GWX | Graphics Link presentation (Genigraphics) |
| GWZ | Graphics Link presentation (Genigraphics) |
| GXL | Graphics library (Genus) |
| GZ | Compressed file (Unix gzip) |
| G721 | Raw CCITT G.721 //$bit ADPCM data |
| G723 | Raw CCITT G.723 3 or 5bit ADPCM data |
| G8 | Raw Graphics (one byte per pixel) Plane III (PicLab) |
| H | Program header (C) |
| HA | Compressed archive (HA) |
| HAM | Driver file (Novell Netware) |
| HAM | Vector graphics saved file (Amiga) |
| HAP | Compressed archive (HA) |
| HBI | Handy Backup file |
| HBK | Handbook (MathCad) |
| HBK | Accounting data file (Humanic Software) |
| HCM | Configuration file (IBM HCM) |
| HCOM | Sound Tools file (HCOM) |
| HCR | Production configuration file (IBM HCD/HCM) |
| HDF | National Center for Supercomputing Applications (NCSA) Geospatial Hierarchical Data |
| HDF | Help file (Help development kit) |
| HDF | Hierarchical Data Format file |
| HDF | Amiga Hardfile Image |
| HDF | Procomm Plus Alternate Download file listing |
| HDL | Alternate download listing (ProComm Plus) |
| HDR | Database header (Pc-File+) |
| HDR | Datafile (Egret) |
| HDR | Message header text (ProComm Plus) |
| HDR | Message header text (1st Reader) |
| HDW | Vector graphics (Harvard Draw) |
| HDX | Help index (AutoCAD) |
| HDX | Help index (Zortech C++) |
| HED | Document (HighEdit) |
| HEL | Hellbender saved game (Microsoft) |
| HEX | Macintosh BinHex 2.0 file |
| HFI | HP font info (GEM) |
| HGL | Drawing file (HP Graphics Language) |
| HH | Help system map (Generic) |
| HH | Header file (C++) |
| HHH | Precompiled header (Power C) |
| HHP | Help information for remote users (ProComm Plus) |
| HIT | Audio file (HitPlayer) |
| HLB | Help library (VAX) |
| HLP | Help file (Generic) |
| HLP | Windows Help file (DataCAD) |
| HMI | Human machine interfaces MIDI music file (Descent) |
| HMM | Alternate mail read option menu (ProComm Plus) |
| HMP | Human machine interfaces MIDI music file (Descent) |
| HNC | Program files (CNC) |
| HOG | Lucas Arts Dark Forces WAD file |
| HOG | Mission file (Descent 1-2) |
| HOG | Main data package file (Descent3) |
| HOT | Document file (HotSend) |
| HP8 | Ascii text Roman8 character set (NewWave Write) |
| HPC | Font language file (Hewlett-Packard) |
| HPF | HP LaserJet font (Adobe Pagemaker) |
| HPF | Partial download file (HotLine) |
| HPG | HPGL Plotter vector graphics (AutoCAD) |
| HPG | HPGL Plotter vector graphics (Harvard Graphics) |
| HPI | Font information (GEM) |
| HPJ | Help Project file (Visual Basic) |
| HPK | Compressed archive (HPACK) |
| HPM | Emm text (HP NewWave) |
| HPM | Alternative menu for privileged users (ProComm Plus) |
| HPP | Program header (C++) |
| HPP | Header file (Zortech C++) |
| HQX | BinHex (Macintosh 4.0) |
| HRF | Rastor graphic (Hitachi) |
| HRM | Alternate menu for limited users (ProComm Plus) |
| HS2 | Monochrome image (Postering) |
| HSC | FM synthesized music file (Used by many old games, e.g.:FINTRIS, ROL) |
| HSI | Graphic (Handmade Software, Inc.) |
| HST | History file (Generic) |
| HST | History file (ProComm Plus) |
| HT | HyperTerminal file |
| HTA | A HTML file that has been used to by viruses to update the system registry |
| HTC | HTML Component |
| HTM | A Web page (a file containing Hypertext Markup Language - HTML - markup) |
| HTML | A Web page (a file containing Hypertext Markup Language - HTML - markup) |
| HTT | Hypertext template (Microsoft) |
| HTX | Template (Extended HTML) |
| HWD | Presentation (Hollywood) |
| HWP | Korean word processor document format (HanGul) |
| HXM | HAM extension (Descent2) |
| HXM | Alternate protocal selection menu (ProComm Plus) |
| HXX | Header file (C++) |
| HY1 | Hyphenation algorythm (Ventura Publisher) |
| HY2 | Hyphenation algorythm (Ventura Publisher) |
| HYC | Datafile (WordPerfect for Windows) |
| HYD | Hyphenation dictionary (WordPerfect for Windows) |
| HYM | 3D Image binary file (Hymarc Scandata Scanner) |
| HYP | Compressed archive (HYPER) |
| H! | On-line Help (Flambeaux Help!) |
| H++ | Header file (C++) |
| H-- | Header file (Sphinx C--) |
| I | Intermediate file (Borland C++) |
| I00 | WinShrink File (I-zero-zero. Usually followed with 1 or more .i0x files, and .md5 file) |
| IAN | Text file (Sterling Software) (Groundworks COOL Business Team Model) |
| IAX | Bitmap (IBM Image Acess eXecutive) |
| IBM | Compressed archive (ARCHDOS, IBM Internal only) |
| ICA | Citrix file |
| ICA | Bitmap graphic (Image Object Content Architecture) |
| ICB | Targa bitmap |
| ICC | Printer file (Kodak) |
| ICC | Catalog file (IronClad) |
| ICD | Drawing file (IronClad) |
| ICL | Icon Library (Generic industry standard) |
| ICM | Image Color Matching profile |
| ICN | Icon source code |
| ICO | Icon (Microsoft Windows 3.x) |
| ICS | Scene file (IronClad) |
| ID | Disk identification file (Generic) |
| IDB | Intermediate file (Microsoft Developer) |
| IDD | MIDI Instrument Definition |
| IDE | Project file (Borland C++ v4.5) |
| IDF | MIDI Instrument Definition (Windows 95 required file) |
| IDIF | Identification file (Netscape saved address book) |
| IDL | OMG Interface Definition Language (IDL) file |
| IDQ | Cognos Impromptu Query Definition |
| IDW | Vector graphic (IntelliDraw) |
| IDX | Relational database index (Microsoft FoxPro) |
| IDX | Relational database index (Symantec Q&A) |
| IDX | Microsoft Outlook Express file |
| IDX | Index file (Microsoft Clip Gallery v. 1.x) |
| IDX | Index file (Pro/Engineer) |
| IFD | Form (JetForm Design) |
| IFD | Adobe Output Designer forms definition source file |
| IFF | Interchange file, (general purpose data storage format)) |
| IFF | Image (Sun TAAC/SDSC Image Tool) |
| IFO | Digital Video Disk (DVD) datafile |
| IFO | Graphic object layer data (ImageForge Pro) |
| IFP | Script file (KnowledgeMan) |
| IFS | Compressed fractal image (Yuvpak) |
| IFS | System file (OS/2) |
| IFS | Create executable library (ImageForge/ImageForge Pro) |
| IGES | Initial Graphics Exchange Specification (Generic) |
| IGF | Metafile (Inset Systems) |
| IIF | Interchange file (QuickBooks for Windows) |
| IIM | Music module |
| ILB | Datafile (Scream Tracker) |
| ILBM | Bitmap (graphic image) |
| ILK | Program outline (Microsoft ILink incremental linker) |
| IM8 | Raster graphic (Sun Microsystems) |
| IMA | Image (WinImage) |
| IMA | Vector graphic (EGO,Chart) |
| IMF | MIDI music file (Corridor 7, Blake Stone, Wolfenstein 3D, Spear of Destiny) |
| IMG | Image (GEM) |
| IMG | Bitmap graphic (Ventura Publisher) |
| IMP | Spreadsheet (Lotus Improv) |
| IMQ | Image presentation (ImageQ) |
| IMR | Cognos Impromptu report |
| IMS | Create executable library data (IconForge) |
| IN$ | Installation file (HP NewWave) |
| IN3 | Input device driver (Harvard Graphics v3.0) |
| INB | Test script (Vermont High Test) |
| INC | Include file (Assembler language or Active Server) |
| IND | Index (dBase IV) |
| IND | Shared Database file (Specifically in Microsoft Windows) |
| INDD | Adobe InDesign document |
| INF | Information file (Generic) |
| INF | Type I LaserJet font information file |
| INF | Install script (Generic) |
| INI | Initialization file (Generic) |
| INI | Setup file (MWave DSP synth's mwsynth.ini GM) |
| INI | Bank setup file (Gravis UltraSound) |
| INK | Pantone reference fills file (CorelDRAW) |
| INL | Inline function file (Microsoft Visual C++) |
| INP | Source code for form, (Oracle,version 3.0 and earlier) |
| INRS | INRS-Telecommunications audio |
| INS | Inspiration file |
| INS | Install script (InstallShield) |
| INS | Sign-up file (X-Internet) |
| INS | Instrument file (Ensoniq EPS Family) |
| INS | Sample (Cell/II MAC/PC instruments) |
| INS | Datafile (WordPerfect for Windows) |
| INS | Installation script (1st Reader) |
| INS | Instrument music file (Adlib) |
| INT | Intermediate executable code (Produced when a source program is syntax-checked) |
| INT | Interfaced units (Borland) |
| INX | Index file (Foxbase) |
| IO | Compressed archive (CPIO) |
| IOB | 3D graphics database (TDDD format) |
| IOC | Organizational chart (Instant ORGcharting!) |
| IOF | Findit document (Microsoft Findit) |
| ION | File description (4dos descript.ion) |
| IPL | Pantone Spot reference pallette (CorelDRAW) |
| IPS | International patching system binary patch file |
| IQY | Internet inquiry (Microsoft) |
| ISO | Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard |
| IRS | Resource file (WordPerfect for Windows) |
| ISD | Spell checker dictionary (RapidFile) |
| ISH | Compressed archive (ISH) |
| ISO | ISO (International Standards Organization table, aka: ISO) |
| ISP | Sign-up file(X-Internet) |
| IST | Instrument file (Digitaltracker) |
| ISU | Uninstall script (InstallShield) |
| IT | Settings file (intalk) |
| ITF | Interface file (JPI Pascal TopSpeed) |
| IT | Music module (MOD) (Impulse Tracker) |
| ITI | Instrument file (Impulse Tracker) |
| ITS | Sample file (Impulse Tracker) |
| ITS | Internet document set (possibly a Microsoft file) |
| IV | Open Inventor file |
| IVD | Microdata dimension or variable-level file (Beyond 20/20) |
| IVP | User subset profile (Beyond 20/20) |
| IVT | Table or aggregate data (Beyond 20/20) |
| IVX | Microdata directory (Beyond 20/20) |
| IW | Screensaver (Idlewild) |
| IW | Presentation flowchart (IconAuthor-HSC Interactive) |
| IWA | Text file (IBM Writing Assistant) |
| IWC | Install Watch document |
| IWM | Start file (IconAuthor) |
| IWP | Text file (Wang) |
| IZT | Binary token file (IZT) |
| J62 | Ricoh camera format file |
| JAD | Java Application Descriptor file |
| JAR | Java ARchive (a compressed file containing a package of Java application-related files) |
| JAS | Graphic (Generic) |
| JAVA | Source code (Java) |
| JBD | Datafile (SigmaScan) |
| JBF | Image browser file (Paint Shop Pro) |
| JBX | Project file (Project Scheduler 4.0) |
| JCP | Java Community Process file |
| JCW | Java Callable Wrapper file |
| JDF | Job Description File (proposed XML-based standard for end-to-end job ticket specification) |
| JFF | JPEG image |
| JIF | JPEG image |
| JFIF | JPEG image |
| JMG | Laservision projection graphics file |
| JMP | Discovery chart-to-statistics (SAS JMP) |
| JN1 | Jill of the Jungle data (Epic MegaGames) |
| JNB | Workbook file (Sigma Plot 5) |
| JNT | Microsoft Windows Journal notes |
| JOB | Vector graphics file created by conversion of a IMG file (QuestVision) |
| JOR | Journal (Microsoft SQL Server) |
| JOU | Journal backup (VAX Edt editor) |
| JPC | Graphic (Japan PIC) |
| JPE | JPEG image |
| JPEG | JPEG compressed bitmap |
| JPG | JPEG bitmap |
| JPG2 | JPEG 2000 image (bitmap) file |
| JS | JavaScript source code |
| JSD | Jet Suite document (eFAX) |
| JSM | Freedom Scientific JAWS for Windows Script Message File |
| JSM | Gray Design Associates Jigsaws Galore Jigsaw File |
| JSM | Steamboat Software Jig ShapeMap |
| JSP | A HTML page containing a reference to a Java servlet |
| JTF | JPEG bitmap |
| JTF | Fax document (Hayes JT Fax) |
| JTF | Bitmap graphic (JPEG Tagged Interchange Format) |
| JTK | Java ToolKit file (Sun Microsystems) |
| JTP | Windows Journal templates |
| JW | Text document (JustWrite) |
| JWL | Library (JustWrite) |
| JXX | C++ Header File |
| JZZ | Spreadsheet (Jazz) |
| K25 | Sample file (Kurzweil 2500) |
| KAR | MIDI file (text+MIDI) (Karaoke) |
| KB | Keyboard script (Borland C++ 4.5) |
| KB | Program source code (Knowledge Pro) |
| KBD | Keyboard mapping script (Procomm Plus, LocoScript, Signature) |
| KBM | Keyboard mapping script (Reflection 4.0) |
| KCL | Lisp source code (Kyoto Common Lisp) |
| KDC | Image (Kodak Photo-Enhancer) |
| KEX | Macro (KEDIT) |
| KEY | Icon toolbar (DataCAD) |
| KEY | Datafile (Forecast Pro) |
| KEY | Keyboard Macro |
| KEY | Security file (Such as a software registration number) |
| KFX | Image (KoFax Group 4) |
| KIZ | Digital postcard (Kodak) |
| KKW | Contains all K-keywords in the RoboHELP Help project Index Designer not associated with topics |
| KMD | Knowledge model, data |
| KMP | KeyMaP (Korg Trinity) |
| KMS | Knowledge model, shortcut |
| KMV | Knowledge model, visual |
| KMZ | Google Earth Saved Working Session file |
| KOS | MicroType Pro document |
| KPL | Kids Programming Language |
| KPP | Toolpad (SmartPad) |
| KPS | Bitmap graphic (IBM KIPS) |
| KQP | Native Camera file (Konica) |
| KR1 | Sample (multi-floppy) file (Kurzweil 2000) |
| KRZ | Sample file (Kurzweil 2000) |
| KSF | Sample File (Korg Trinity) |
| KSF | Stepfile format of several Pump It Up simulators |
| KYB | Keyboard mapping (FTP) |
| KYE | Game data (Kye) |
| L | Source code (Lex) |
| L | Source code (Lisp) |
| L | Linker directive file (WATCOM wlink) |
| LAB | Datafile (NCSS-SOLO) |
| LAB | Label file (Visual dBase) |
| LAB | Mailing labels (Microsoft Excel) |
| LAN | Loadable module (LAN DLL) (NetWare) |
| LAY | Word Chart layout (APPLAUSE) |
| LAY | Clipart file (Printmaster Gold) |
| LBG | Label generator data (dBase IV) |
| LBL | Label (dBase IV) |
| LBL | Label (Clipper 5) |
| LBL | Label (dBFast) |
| LBM | Bitmap (DeluxePaint) |
| LBM | Linear Bitmap graphics (XLib) |
| LBO | Compiled label (dBase IV) |
| LBR | Compressed archive (LU) |
| LBR | Display driver (Lotus 1-2-3) |
| LBT | Labels (Microsoft FoxPro) |
| LBX | Labels (Microsoft FoxPro) |
| LCF | Linker control file (Norton Guides compiler) |
| LCH | Used in a program (unknown) that monitors a network's response time |
| LCK | Lockfile (Paradox) |
| LCL | Datafile (FTP) |
| LCN | Lection document (WordPerfect for Windows) |
| LCS | Data History file (ACT!) |
| LCW | Spreadsheet (Lucid 3-D) |
| LD | Long distance area codes file (Telix) |
| LD1 | Overlay file (dBase) |
| LDB | Lock file (Microsoft Access) |
| LDF | Library definition file (Geoworks Glue) |
| LDIF | Structured text file used for sharing information between E-Mail clients (Microsoft, Netscape and others) |
| LDL | Library (Corel Paradox) |
| LDS | LOUDNESS Sound System File |
| LEG | Legacy document |
| LES | System game profiles (same as REG file) (Logitec Entertainment) |
| LET | Broderbund CreataCard Letterhead file |
| LET | Genesis 2000 mortgage application file |
| LET | Letter (generic) |
| LET | Unknown photo image |
| LEV | Level file (NetHack 3.x) |
| LEX | Dictionary file (Generic) |
| LFD | Data resource file (LucasArts Dark Forces) |
| LFP | LaserForms Plus file (Evergreen) |
| LFT | Loft file (3-D Studios) (DOS) |
| LFT | Laser printer font (ChiWriter) |
| LG | Logo procedure definition (LSRHS Logo) |
| LGC | Application log file |
| LGD | Application log file |
| LGO | Logo file (PaintBrush) |
| LGO | Header and footer logo (SuperFax) |
| LGO | Startup logo (Microsoft Windows 3.x-9.x) |
| LHA | Alternate file suffix for LZH |
| LHA | Compressed Archive (LHA/LHARC) |
| LHW | Compressed Amiga archive (LHWARP) |
| LIB | Library file (Generic) |
| LIF | Logical Interchange data (Hewlett-Packard) |
| LIF | Compressed archive (Generic) |
| LIM | Compressed archive (LIMIT) |
| LIN | Line type file (DataCad) |
| LIN | Interactive music sequencing data file (Electronic Arts) |
| LIS | Output file produced by a Structured Query Reporting (SQR) program |
| LIS | Listing (VAX) |
| LIT | eBook file for Microsoft Reader |
| LIX | Logos library system file |
| LJ | Text file (Hewlett-Packard LaseJet II printer) |
| LK | Database file (OpenSight-16 bit) |
| LKO | Linked object (Microsoft Outlook Express Junkmail file) |
| LL3 | Document file (LapLink III) |
| LLX | Exchange agent (Laplink) |
| LNK | Shortcut file (Microsoft Windows 9.x) |
| LNK | Linker response file (RTLink) |
| LNK | Datafile (Revelation) |
| LNT | LiveNote Transcript file |
| LOD | Load file (Generic) |
| LOG | Log file (Generic) |
| LOK | Compressed file (FileWrangler) |
| LP | A document reader used for downloading mortgage closing information (DesertDocs) |
| LPC | Printer driver (TEKO) |
| LPD | Helix Nuts and Bolts file |
| LPI | Information file for laser printers (common with some scanning sofware) |
| LRC | Lyrics file used by music game emulators |
| LRC | Video phone file (Intel) |
| LRF | Linker response file (Microsoft C/C++) |
| LRS | Language resource file (WordPerfect for Windows) |
| LSF | Logos library system file |
| LSL | Saved library (Corel Paradox) |
| LSL | Script library (Lotus) |
| LSP | AutoLISP, CommonLISP, and other LISP language files |
| LSS | Spreadsheet (Legato) |
| LST | List file (Generic) |
| LST | Keyboard macro (1st Reader) |
| LST | SAS text output |
| LST | Spool file (Oracle) |
| LTM | Form (Lotus Forms) |
| LU | Library unit file (ThoughtWing) |
| LVL | Miner Descent/D2 Level extension (Parallax Software) |
| LWA | Lightwave Scene (version 6 and up) |
| LWD | Text document (LotusWorks) |
| LWF | Wavelet graphics file (Luratech) |
| LWLO | Layered Object file (Lightwave) |
| LWO | Lightwave Object (version 6 and up) |
| LWOB | Object file (Lightwave) |
| LWP | Wordpro 96/97 file (Lotus) |
| LWSC | Scene file (Lightwave) |
| LWZ | Linguistically enhanced sound file (Microsoft) |
| LYR | Layer file (DataCAD) |
| LZD | Difference file for binaries (Ldiff 1.20) |
| LZH | Compressed archive (LH ARC) |
| LZS | Compressed archive (LARC) |
| LZS | Data file (Skyroads) |
| LZW | Compressed Amiga archive (LHWARP) |
| LZX | Compressed archive (Generic) |
| M | Program file (Matlab) |
| M | Macro module (Brief) |
| M | Standard package (Mathematica) |
| M11 | Text file (MASS11) |
| M1U | Pocket TV (PDA) file |
| M1V | MPEG-related file (MIME type 'mpeg') |
| M2P | Canopus MPEG-2 video file |
| M3 | source code file (Modula 3) |
| M3D | 3D animation (Corel Motion) |
| M3U | MPEG URL (MIME audio file) (MP3 Playlist) |
| M4 | M4 Preprocessor file (Unix) |
| M4A | Unprotected AAC audio file |
| M4A | Protected AAC audio file (possibly from iTunes Music Store) |
| M4B | MPEG-4 Audio Layer Bookmarkable File |
| M4P | MPEG-4 Video File |
| M_U | Hard Drive Boot sector backup (MazeGold) |
| MA3 | Macro (Harvard Graphics 3.0) |
| MAC | Image (MacPaint) |
| MAC | Macro (Generic) |
| MAD | Module (Microsoft Access) |
| MAF | Form (Microsoft Access) |
| MAG | A graphics format found in some Japanese files |
| MAG | MAG graphics format created by Woody Lynn (MPS Magro Paint System) |
| MAGIC | Configuration file (Magic Mail Monitor) |
| MAI | Mail (VAX) |
| MAK | Project (Visual Basic or Microsoft C++) |
| MAK | Makefile (Generic) |
| MAM | Macro (Microsoft Access) |
| MAN | Manual page output (Unix) |
| MAN | Command module (Unix) |
| MAP | Map file (Generic) |
| MAP | WAD game file (Duke Nukem 3D) |
| MAP | Color pallette (Generic) |
| MAP | Format data (Micrografx Picture Publisher) |
| MAP | Linker map file |
| MAP | Map file used for color choices (Pro/Engineer) |
| MAP | Map file (Atlas MapMaker) |
| MAP | Network map (AccView) |
| MAQ | Query (Microsoft Access) |
| MAR | Report (Microsoft Access) |
| MAR | Assembly program (VAX Macro) |
| MAS | Graphics file (Lotus Freelance Smartmaster) |
| MAT | Binary file (Matlab) |
| MAT | Table (Microsoft Access) |
| MAUD | Sample format (Maud) |
| MAX | 3D scene (Kinetix 3D Studio Max) |
| MAX | Document (Paperport) |
| MAX | Layout file (OrCad) |
| MAX | Source code (MAX) |
| MAZ | Maze data file (Hover) |
| MAZ | A format use by Division's dVS/dVISE |
| MB | Memo field values for database (Paradox) |
| MB1 | Data file (Apogee Monster Bash) |
| MBK | Multiple index archive (dBase IV) |
| MBOX | Mailbox file (Berkeley Unix) |
| MBX | Extension Microsoft Outlook adds to saved email, Eudora mailboxes |
| MCC | Calling card (Dialer10) |
| MCC | Configuration file (MathCad) |
| MCD | Document (MathCad) |
| MCF | Font file (MathCad) |
| MCF | Magic control file |
| MCI | Command script (Media Control Interface) |
| MCP | Project file (Metrowerks CodeWarrior) |
| MCP | Application script (Capsule) |
| MCP | Printer driver (MathCad) |
| MCR | Keyboard macro file (DataCad) |
| MCW | Document (Microsoft Word for Macintosh) |
| MCW | Text document (MacWrite II) |
| MD | Compressed archive (MDCD) |
| MDA | Add-in file (Microsoft Access) |
| MDA | Workgroup (Microsoft Access version 2) |
| MDB | Database (Microsoft Access) |
| MDE | MDE file (Microsoft Access) |
| MDF | Adobe Output Designer and Central Pro Server Compiled Forms Definition |
| MDI | Borland Multiple Document Interface file |
| MDI | Office Document Imaging file |
| MDI | Microsoft Digital Imaging Format file |
| MDI | MIDIsequention Sound file |
| MKP | Autodesk Visual Lisp IDE Markup file |
| MDL | Spreadsheet (CA-Compete!) |
| MDL | Music module (MOD) (Digital Trakker) |
| MDL | Model (3D Design Plus) |
| MDL | Model file (Quake) |
| MDL | Model file element (Rational Rose) |
| MDM | Modem definition (Telix) |
| MDN | Blank database template (Microsoft Access) |
| MDT | Data table (Microsoft ILink incremental linker) |
| MDT | Add-in file (Data) (Microsoft Access) |
| MDW | Workgroup (Microsoft Access) |
| MDX | Multiple index file (dBase IV) |
| MDZ | Wizard template (Microsoft Access) |
| ME | ASCII text document (Generic) |
| MEB | Macro editor bottom overflow library (WordPerfect for Windows) |
| MED | Music module (MOD) (OctaMed Music Editor) |
| MED | Macro editor delete save file (WordPerfect for Windows) |
| MEM | Macro editor macro (WordPerfect for Windows) |
| MEM | Memory variable save file (Clipper) |
| MEM | Memory variable save file (dBase IV) |
| MEM | Memory variable save file (Microsoft FoxPro) |
| MEQ | Macro editor print queue file (WordPerfect for Windows Library) |
| MER | Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others |
| MER | Macro editor resident area (WordPerfect for Windows Library) |
| MES | Macro editor workspace file (WordPerfect for Windows) |
| MES | Message file (Generic) |
| MET | Presentation Manager metafile |
| MET | Macro editor top overflow file (WordPerfect for Windows Library) |
| MET | Document file (OmniPage Pro) |
| MEU | Menu group (DOS Shell) |
| MEX | Executable command (Matlab) |
| MEX | Macro editor expound file (WordPerfect for Windows) |
| MF | Metafont text file |
| MFG | Manufacturing file (Pro/ENGINEER) |
| MGF | Font file (MicroGrafx) |
| MGF | A file in a Materials and Geometry Format |
| MHP | Microsoft Home Publishing file |
| MHT | MHTML document (Microsoft) |
| MHTM | MHTML document (MIME) |
| MHTML | MHTML document (MIME) |
| MI | Data file (Cocreate ME10) |
| MI | Miscellaneous file (Generic) |
| MIC | Image Composer file (Microsoft) |
| MID | MIDI music |
| MIF | Interchange format (Adobe FramMaker) |
| MIFF | Machine Independent File (Generic) |
| MII | Datafile (MicroStat-II) |
| MIM | A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MIM file can be "opened" (unarchived and separated into individual files) using Winzip or a similar program. |
| MIME | See MIM. |
| MIX | Object file (Power C) |
| MIX | Picture file (Microsoft PhotoDraw 2000) |
| MIX | Picture file (Microsoft Picture-It!) |
| MIX | Package file (Command & Conquer) |
| MIX | Resource archive (Westwood Studios) |
| MJF | Audio file similar to MP3 (Mjuice) (Opens with WinAmp) |
| MK | Makefile (Generic) |
| MKE | Makefile (Microsoft Windows SDK) |
| MKI | Graphic Image (MagView 5.0) (Japanese) |
| MKP | Autodesk Visual Lisp IDE Markup file |
| MKS | Datafile (TACT) |
| ML3 | Project file (Milestones 3.x) |
| MLB | Macro library (Symphony) |
| MLI | A file in 3D Studio's Material-Library format |
| MLID | Muliple link interface driver file (Generic) |
| MLM | Groupwise email file (Novell Groupwise) |
| MM | Text file (MultiMate Advantage II) |
| MMAP | MindManager Brainstorm and Process Control Map |
| MMC | Catalog file (Microsoft Clip Gallery 5.x) |
| MME | A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MME file can be "opened" (unarchived and separated into individual files) using Winzip or a similar program. |
| MMF | Meal Master Format, a recipe catologing format |
| MMF | Mail file (Microsoft) |
| MMG | Beyond 20/20 table or aggregate data file |
| MML | Bulk mail file (Created by MyMailList) |
| MMM | Multimedia movie (Microsoft) |
| MMM | Multimedia movie (MacroMind Director 3.x) |
| MMO | Memo Writer file (RapidFile) |
| MMP | MindManager file (MindMapor) |
| MMP | Output video (Bravado) |
| MN2 | Mission file (Descent2) |
| MN3 | Mission file (Descent3) |
| MND | Menu source (AutoCAD Menu Compiler) |
| MND | Mandelbrot for Windows |
| MNG | Map (DeLorme Map'n'Go) |
| MNG | Multi-image Network Graphics |
| MNI | Mandelbrot for Windows |
| MNT | Menu file (Microsoft FoxPro) |
| MNU | Menu file (Visual dBase) |
| MNU | Advanced macro (HP NewWave) |
| MNU | Interact menu (Intertal Systems) |
| MNU | Menu (AutoCAD Menu Compiler) |
| MNU | Menu (Norton Commander) |
| MNX | Menu (Microsoft FoxPro) |
| MNX | Compiled menu (AutoCAD) |
| MNY | Account book (Microsoft Money) |
| MOB | Device definition (PEN for Windows) |
| MOD | FastTracker, StarTrekker, Noise Tracker (etc.) music module file |
| MOD | Spreadsheet (Microsoft Multiplan) |
| MOD | Modula-2 source code file (Clarion Modula-2) |
| MOD | Kernel module (Microsoft Windows 9.x) |
| MOD | Amiga/PC tracker module |
| MOF | Windows Management Object file |
| MON | Monitor description (ReadMail) |
| MOV | Movie (QuickTime for Microsoft Windows) |
| MOV | Movie (AutoCAD/AutoFlix) |
| MOZ | Zipped (Compressed) mod file |
| MP2 | MPEG Audio Layer 2 file (MIME video file) |
| MP3 | MPEG Audio Layer 3 (AC3) file |
| MP4A | MPEG Audio Layer 4 file |
| MPA | MPEG-related file (MIME type 'mpeg') |
| MPC | Calendar file (Microsoft Project) |
| MPD | Database file (Microsoft Project) |
| MPE | MPEG animation |
| MPEG | MPEG animation |
| MPG | MPEG animation |
| MPM | Mathplan Macro library (WordPerfect for Windows) |
| MPP | Project file (Microsoft Project) |
| MPP | Drawing file (CAD) |
| MPQ | Blizzard game data file |
| MPR | Menus (compiled) (Microsoft FoxPro) |
| MPT | Bitmap graphics (Multipage TIFF) |
| MPV | View file (Microsoft Project) |
| MPX | Compiled menu program (Microsoft FoxPro) |
| MPX | Exchange file (Microsoft Project) used for exporting data |
| MPZ | DraCAD (Japanese) file |
| MRB | Multiple resolution bitmap graphics (Microsoft C/C++) |
| MRI | MRI Scan |
| MRS | Macro resource file (WordPerfect for Windows) |
| MSA | Archive (Magic Shadow) |
| MSC | Makefile (Microsoft C) |
| MSC | Common console document (Microsoft Windows 2000) |
| MSD | Diagnostics report file (Microsoft MSD) (Diagnostics) |
| MSDL | Scene Description Language (Manchester) |
| MSF | Network 7.0 mail file |
| MSG | Mail message (Microsoft) |
| MSI | Installer package (Microsoft Windows) |
| MSN | Network document (Microsoft) |
| MSN | Mission File (Descent) |
| MSP | Paint bitmap (Microsoft) |
| MSP | Windows Installer patch file |
| MSS | Manuscript text file (Perfect Writer) |
| MSS | Manuscript text file (Scribble) |
| MSS | Manuscript text file (MINCE) |
| MSS | Manuscript text file (Jove) |
| MST | Windows Installer transform |
| MST | Minispecification file (Prosa) |
| MST | Setup script (Microsoft SDK) |
| MSV | Sony Memory Stick Compressed Voice File; requires Sony plug-in for Windows Media Player |
| MSW | Text file (Microsoft Word) |
| MSX | Compressed CP/M archive (MSX) |
| MTH | Math file (Derive) |
| MTM | Music module (MOD) (Multitracker) |
| MTW | Datafile (Minitab) |
| MTX | Twain device driver (32 bit)(UMax) |
| MU | Menu (Quattro Pro) |
| MUL | Online game called Ultima online |
| MUS | Music (Generic) |
| MUS | Interactive music audio data file (Electronic Arts) |
| MUS | Music (MusicTime) |
| MUS10 | Audio (Mus10) |
| MV | Server-side script file (Miva) |
| MVA | Video accelerator file (Matrox) |
| MVB | Multimedia Viewer file (Microsoft) |
| MVC | Image file (Sony Digital Mavica) |
| MVE | Interplay video file (Descent2, Fallout2) |
| MVF | Stop frame file (AutoCAD-AutoFlix) |
| MVI | Movie command file (AutoCAD-AutoFlix) |
| MVL | 3D ultrasound file |
| MVL | Descent 2 (game) movie archive |
| MVW | Log file (Saber LAN) |
| MWF | Animation (ProMotion) |
| MWP | Smartmaster file (Lotus WordPro 97) |
| MXD | Map file (ArcInfo) |
| MXT | Datafile (Microsoft C) |
| MYP | Presentation file (Make Your Point) |
| NAN | Nanoscope files (Raw Grayscale) |
| NAP | Metafile (NAP) |
| NAP | Video file (EnerGraphics) |
| NB | Text file (Nota Bene) |
| NC | Instructions for numerical control machine (CAMS) |
| NCB | Developer Studio file (Microsoft) |
| NCC | CNC (Computer Numeric Control) file (CamView 3D) |
| NCD | Change directory (Norton) |
| NCF | Command File (Netware) |
| NCF | Internal clipboard (Lotus Notes) |
| NCH | Outlook Express folder file |
| NCO | Nero BackItUp compressed backup file |
| NDB | Network database (Intellicom) |
| NDB | NetOp database (Danware Data) |
| NDO | 3D low-polygon modeler (Nendo) |
| NDX | Index file (dBase II-III-IV) |
| NDX | Database file (1ACT! for Microsoft Windows) |
| NDX | Index file (Cindex) |
| NEO | Raster graphics (Atari Neochrome) |
| NES | Emulator ROMS for game console (Nintendo) |
| NET | Network configuration file |
| NET | Netlist output file (Orcad Schematic Capture) |
| netCDF | Network Common Data Form |
| NEW | New info |
| NEZ | Emulator file used for game consoles (NES) |
| NFF | Neutral File Format |
| NFO | Info file database text |
| NFO | Infobase file (Folio) |
| NFT | Template file (Netobject Fusion) |
| NG | Online documentation database (Norton Guide) |
| NIL | Icon Library file (EasyIcons-compatible) (Norton) |
| NIST | Audio (NIST Sphere) |
| NLB | Data (Oracle 7) |
| NLM | Loadable Module (Netware) |
| NLO | NetG Skill Builder file |
| NLS | National Language Support file used for localization (for example, by Uniscape) |
| NLU | E-Mail Trigger file (Norton LiveUpdate) |
| NLX | Form (FormWorx 3.0) |
| NOD | File (Netobject Fusion) |
| NP | Project schedule (Nokia Planner) |
| NP | Project schedule (Visual Planner 3.x) |
| NPI | Source for interpreter (dBase Application Generator) |
| NRF | Data file (NICOLET) |
| NRG | Image file (Nero) |
| NRI | iManage file |
| NRL | iManage infoRite document hyperlinks |
| NRL | Template (Microsoft Outlook) |
| NSF | Database (Lotus Notes) |
| NSO | Document file (NetObject Fusion) |
| NST | Music module (MOD) (Noise Tracker) |
| NSV | Nullsoft streaming video file that comes with Winamp |
| NS2 | Database (Lotus Notes version 2) |
| NS3 | Database (Lotus Notes version 3) |
| NS4 | Database (Lotus Notes version 4) |
| NT | Startup files (Microsoft Windows NT) |
| NTF | Database template (Lotus Notes) |
| NTR | Executable ASCII text file |
| NTS | Tutorial (Norton) |
| NTS | Executable ASCII text file |
| NTX | Index file (CA-Clipper) |
| NUF | Message for new users (1st call) (Procomm Plus) |
| NWC | Song file (Noteworthy Composer) |
| NWS | News message (MIME RFC822) (Microsoft Outlook Express) |
| NXT | Sound file (NeXT) |
| O | Object file (Unix) |
| O | Object file (Atari) |
| O | Object file (GCC) |
| OAS | Word processor document (Fujitsu OAS)(Japanese) |
| OAZ | Fax (NetFax Manager) |
| OB | Object cut/paste file (IBM LinkWay) |
| OBD | Binder template (Microsoft Office) |
| OBD | Binder (Microsoft Office) |
| OBJ | Object file |
| OBR | Object browser data file (Borland C++) |
| OBS | Script (ObjectScript) |
| OBV | Visual interface (ObjectScript) |
| OBZ | Binder Wizard (Microsoft Office) |
| OCF | Object craft file (Object Craft) |
| OCR | Transcribed fax-to-text file (FAXGrabber) |
| OCX | OLE custom control |
| ODC | OpenDocument Chart |
| ODG | OpenDocument Graphic |
| ODI | OpenDocument Image |
| ODIF | OpenDocument Chart Template/td> |
| ODIF | OpenDocument Interchange Format |
| ODL | Type library source (Visual C++) |
| ODP | OpenDocument Presentation file |
| ODS | Mailbox file (Microsoft Outlook Express) |
| ODS | OpenDocument Spreadsheet |
| ODT | OpenDocument Text file |
| OFD | Form definition (ObjectView) |
| OFF | Object File (3D Mesh) |
| OFN | FileNew file (Microsoft Office) |
| OFT | Template (Microsoft Outlook) |
| OGG | Ogg Vorbis audio file |
| OGM | Ogg Media video file |
| OKR | Feldeinteilung module file (3-D Fassade Plus) |
| OKT | Music module (MOD) (Oktalyzer) |
| OLB | Object Library (OLE) (Microsoft) |
| OLB | Object library (VAX) |
| OLD | Backup file (Generic) |
| OLE | Object Linking and Embedding (OLE) custom control (Microsoft) |
| OLI | Text file (Olivetti) |
| OMC | Atrac3 (Sony Music Store) audio file |
| OMF | Open Media Format File |
| OO1 | Voice file (Typhoon) |
| OOGL | Object Oriented Graphics Library |
| OOM | Swap file (Shroom) |
| OPJ | Project file (Orcad Schematic Capture) |
| OPL | Organiser Programming Language source file (Psion/Symbian) |
| OPN | Active options (Exact) |
| OPO | Output executable file (OPL) |
| OPT | Developer Studio file (Microsoft) |
| OPT | Optimize support file (QEMM) |
| OPW | Organization chart (Org Plus for Windows) |
| OPX | Extension DLL (OPL) |
| OPX | Inactive options (Exact) |
| OPX | Microsoft Organizer Organization Chart |
| ORA | Parameter file (Oracle) |
| ORC | Script (Oracle 7) |
| ORG | Calendar file (Lotus Organizer) |
| OR2 | Calendar file (Lotus Organizer 2) |
| OR3 | Lotus Organizer 97 file |
| ORA | Configuration file (Oracle 7) |
| OSS | Search file (Microsoft Office) |
| OST | Offline file (Microsoft Exchange/Outlook) |
| OTG | OpenDocument Graphic Template |
| OTI | OpenDocument Image Template |
| OTL | Outline font description (Z-Soft Type Foundry) |
| OTL | Template file (Super NoteTab) (Fookes) |
| OTL | Template file (PrintMaster Gold) |
| OTT | OpenDocument Text Template |
| OTX | Text file (Olivetti Olitext Plus) |
| OUT | Output file (Microsoft C) |
| OV | Database file (Revelation-DOS) |
| OV1 | Overlay file |
| OV2 | Overlay file |
| OVD | Datafile (ObjectVision) |
| OVL | Overlay file |
| OVR | Overlay file |
| O$$ | Outfile (Sprint) |
| P | Source code (Pascal) |
| P | Application parameter file (ReaGeniX code generator) |
| P | Picture file (APPLAUSE) |
| PA | Print Artist Project file |
| PA1 | Worktable (PageAhead) |
| PAB | Personal Address Book (Microsoft) |
| PAC | Package file (Sound Blaster Studio II) |
| PAC | Image (Stad) |
| PAD | Keypad definition (Telemate) |
| PAF | Personal Ancestry File (free genealogy software from the Mormon Church) |
| PAK | Compressed archive (PAK) |
| PAK | WAD file (Quake) |
| PAL | A compressed file (Generic) |
| PAL | Color palette (Microsoft) |
| PAN | Printer specific file (CorelDRAW) |
| PAQ | Password encrypted zip file (Hewlett-Packard) |
| PAR | Parts application (Digitalk PARTS) |
| PAR | Parameter file (Fractint) |
| PAR | Permanent output file (Microsoft Windows 3.x) |
| PART | eDonkey partial download |
| PART | eMule partial download |
| PART | Go!Zilla partial download |
| PAS | Source code file (Borland Pascal) |
| PAT | Hatch pattern file (DataCAD) |
| PAT | Pattern file (CorelDRAW) |
| PAT | Patch file (Advanced Gravis Ultrasound/Forte Technologies) |
| PAT | exePatch utility used for Warcraft2 (WarHack) |
| PB | Fax (FAXability Plus) |
| PB | Phone book (WinFax Pro) |
| PB | Setup file (PixBase) |
| PB1 | Document (First Publisher for Windows) |
| PBA | Source code file (Powerbasic BASIC) (Genus) |
| PBD | Phone book (FaxNOW!-Faxit) |
| PBD | Dynamic library, an alternative to a native DLL (PowerBuilder) |
| PBF | Turtle Beach Pinnacle Bank File |
| PBI | Include file (PowerBasic) (Genus) |
| PBI | Profiler binary input file (Microsoft Source Profiler) |
| PBK | Microsoft Phonebook |
| PBL | Library file used in a development environment (PowerBuilder) |
| PBL | PowerBasic library (Genus) |
| PBM | Portable bitmap graphic |
| PBM | Planar bitmap graphic (XLib) |
| PBN | Portable Bridge Notation file |
| PBO | Profiler binary output (Microsoft Source Profiler) |
| PBR | Resource file (PowerBuilder) |
| PBT | Profiler binary table (Microsoft Source Profiler) |
| PC | Text file (IBM) |
| PC3 | Custom palette (Harvard Graphics 3.0) |
| PC8 | Ascii text IBM8 character set (NewWave Write) |
| PCB | Application data file (Microsoft Powerpoint) |
| PCC | Cutout picture vector graphics (PC Paintbrush) |
| PCD | Image (Kodak Photo-CD) |
| PCD | P-Code compiled test scripts as in Microsoft Test and Microsoft Visual Test |
| PCE | Maps Eudora mailbox names to DOS filenames |
| PCF | Profiler command file (Microsoft Source Profiler) |
| PCH | Patch file (Generic) |
| PCH | Precompiled header file (Microsoft C/C++) |
| PCI | PCI Miniport file (Microsoft Windows System file) |
| PCJ | Multimedia authoring tool graphics (IBM Linkaway-Live) |
| PCK | Pickfile (Turbo Pascal) |
| PCL | Printer Control Language file (printer-ready bitmap) (Hewlett-Packard) |
| PCM | Audio file |
| PCM | PCM file (OKI MSM6376 Sythesizer Chip) |
| PCP | Live Update Pro file (Symantec) |
| PCS | Animation (PICS) |
| PCS | Picture storage file (Microsoft) |
| PCT | PICT drawing (Macintosh) |
| PCW | Text file (PC Write) |
| PCX | PC Paintbrush bitmap (ZSoft) |
| PDA | Bitmap graphics |
| PDB | Data file (TACT) |
| PDB | Physical model backup file (PowerDesigner) |
| PDB | Database file (3Com PalmPilot) |
| PDB | Brookhaven Protein Database file |
| PDD | Graphic image that can be opened with Paint Shop Pro and Adobe PhotoDeluxe |
| PDF | Portable Document file (Adobe Acrobat) (displayable with a Web browser) |
| PDF | Definition File |
| PDF | Printer Definition File (Netware) |
| PDF | Graphics file (ED-SCAN 24bit) |
| PDL | Project description language file (Borland C/C++) |
| PDM | Physical model file (PowerDesigner) |
| PDP | Print Shop Deluxe file (Broderbund) |
| PDQ | Flowcharting PDQ Lite file (Patton&Patton) |
| PDS | Broderbund Print Shop Deluxe |
| PDS | NASA Planetary Data System Format Space Mission Data |
| PDS | Photographic image file (origin not yet identified) |
| PDS | PLDASM Source Code |
| PDS | Print Shop Graphic |
| PDS | Hardware assembly source code file (Pldasm) |
| PDT | Database file (ProCite) |
| PDV | Printer driver (Paintbrush) |
| PDW | Document (Professional Draw) |
| PDX | Adobe Acrobat Catalog Index |
| PDX | Active Sensing PDXplorer IPC-2570 Product Data Exchange Information File |
| PDX | Adobe Acrobat Catalog Index |
| PDX | Database index file (ProCite) |
| PE3 | Image archive file (Ulead PhotoImpact) |
| PE3 | Image archive file (QuickViewer) |
| PE4 | Image archive file (Ulead PhotoImpact v.4.0) |
| PEB | Program Editor bottom overflow file (WordPerfect for Windows Library) |
| PED | Program Editor delete save file (WordPerfect for Windows) |
| PEM | Program Editor macro (WordPerfect for Windows library) |
| PEQ | Program Editor print queue file (WordPerfect for Windows) |
| PER | Program Editor resident area file (WordPerfect for Windows Library) |
| PES | Program Editor work space file (WordPerfect for Windows Library) |
| PET | Program Editor top overflow file (WordPerfect for Windows Library) |
| PF | Encrypted file (Alladin Systems) |
| PF | Windows XP prefetch file (data read into RAM in anticipation of a user asking for it) |
| PFA | Type 3 font (ASCII) |
| PFB | Type 1 font (binary) |
| PFC | PF Component file |
| PFC | Text file (First Choice) |
| PFC | Personal filing cabinet file (AOL) |
| PFD | SoftPro Real Estate Proform Document Format |
| PFF | Paraform file for 3D modeling (Scandata) |
| PFK | Programmable function keys (XTreePro) |
| PFM | Printer Font Metrics (Microsoft) |
| PFS | Database text file (PFS:Write) |
| PFT | Printer font (ChiWriter) |
| PG | Page cut/paste file (IBM LinkWay) |
| PGI | Printer graphics file device driver (PGRAPH Library) |
| PGL | Plotter drawing (Hewlett-Packard) |
| PGM | Portable Graymap (bitmap) |
| PGM | Program file (Signature) |
| PGN | Portable game notation file (ChessMaster and others) |
| PGP | PGP encrypted file |
| PGS | Manual page (man4dos) |
| PH | Temporary file generated by Microsoft Help Compiler |
| PH | Optimized .goh file (Geoworks) |
| PH | Perl header file |
| PH | Phrase-table (Microsoft C/C++) |
| PHN | Phone list (UltraFax) |
| PHN | Phone list (QmodemPro) |
| PHO | Phone database (Metz Phone for Windows) |
| PHP | HTML page that includes a PHP script |
| PHP3 | HTML page that includes a PHP script |
| PHR | Phrases (LocoScript) |
| PHR | Zoom MRS-802 Phrase Audio Data file |
| PHS | PHScript File |
| PHTML | HTML page that includes a PHP script |
| PHTML | perl-parsed HTML |
| PI1 | Low resolution picture file (Dages Elite) |
| PI2 | Medium resolution picture file (Dages Elite) |
| PI3 | High resolution picture file (Dages Elite) |
| PIC | Bitmap (PC Paint) |
| PIC | Pixar picture file (SDSC Image Tool) |
| PIC | Picture file (Lotus) |
| PIC | PICT drawing (Macintosh) |
| PIC | 3D Image file (SoftImage) |
| PICT | PICT image file (Macintosh) |
| PIF | Program Information File |
| PIF | PIF drawing (IBM) |
| PIF | Vector graphics GDF file (IBM Mainframe) |
| PIF | Compressed archive (Macintosh) |
| PIG | WAD file (Lucas Arts Dark Forces |
| PIN | Data file (Epic Pinball) |
| PIN | Data file (Epic Pinball) |
| PINS | Password file of the program PINs, Passwords & Co. |
| PIX | Bitmap (Inset Systems) |
| PIX | Alias image file (SDSC Image Tool) |
| PJ | Project file (CA-SuperProject) |
| PJ | Source Integrity file (MKS) |
| PJT | Visual FoxPro memo file (Microsoft) |
| PJT | Visual Foxpro Project (Microsoft) |
| PJX | Visual FoxPro project file (Microsoft) |
| PK | Packed bitmap font file (TeX DVI) |
| PKA | Compressed file archive (PKARC) |
| PKG | Developer Studio application extension (similar to a DLL file) (Microsoft) |
| PKG | Installer script (NEXT) |
| PKR | Public Keyring (PGP) |
| PKT | Packet file (Fidonet) |
| PL | Interleaf printerleaf (or WorldView) format |
| PL | Source code file (Perl) |
| PL | Source code file (Prolog) |
| PL | Property list font metric file (TeX) |
| PL | Palette (Harvard Graphics) |
| PL1 | Room plan (3D Home Architect) |
| PL3 | Chart palette (Harvard Graphics 3.0) |
| PLB | Library file (Microsoft FoxPro) |
| PLC | Add-in file (Lotus 1-2-3) |
| PLG | A format use by REND386/AVRIL |
| PLI | Data description file (Oracle 7) |
| PLL | Pre-linked library file (Clipper 5) |
| PLM | Module (DisorderTracker2) |
| PLN | Spreadsheet (WordPerfect for Windows) |
| PLR | Pilot file (Descent 1-3) |
| PLS | Sample file (DisorderTracker2) |
| PLS | MPEG PLayList file (used by WinAmp) |
| PLS | MYOB Plus file |
| PLT | Drawing (HPGL Plotter) |
| PLT | Plot drawing (AutoCAD) |
| PLT | Palette (Generic) |
| PLT | Pre-linked transfer file (Clipper 5) |
| PLT | Sign-making software (Gerber Optical) |
| PLY | Data file (PopMail) |
| PLY | Presentation screen (Harvard Spotlight) |
| PM | Bitmap graphics (Presentation Manager) |
| PM | Module (Perl) |
| PM3 | Document (PageMaker 3.0) |
| PM4 | Document (PageMaker 4.0) |
| PM5 | Document (PageMaker 5.0) |
| PM6 | Document (PageMaker 6.0) |
| PMC | Graphics (A4TECH Scanner) |
| PMD | Adobe PageMaker 7.x file |
| PMM | Program file (Amaris BTX/2) |
| PN3 | Printer device driver (Harvard Graphics 3.0) |
| PNG | Bitmap (Portable Network Graphics) |
| PNG | Browser catalogue (Paint Shop Pro) |
| PNG | Bitmap file (MacroMedia FireWorks) |
| PNG | PrintMaster graphics file |
| PNM | Portable aNY Map graphics (PBM) |
| PNT | Graphic file (MacPaint) |
| PNT | QWK reader pointer file (MarkMail 2.x) |
| PNT | Pen Table plotting file (Pro/Engineer) |
| PNTG | Same as PNT file |
| POG | PIG file extension (Descent2) |
| POH | Optimized .goh file (Geoworks) |
| POL | Windows NT Policy file |
| POL | 3D polygonal modeling file (Innovmetric) |
| POP | Popup file (Visual dBase) |
| POP | Message index (PopMail) |
| POT | PowerPoint template (Microsoft) |
| POV | Persistence of Vision file (Ray-Tracer) |
| POW | Chord chart (PowerChords) |
| PP | Compressed Amiga archive (POWERPACKER) |
| PP4 | Bitmap (Picture Publisher 4) |
| PPA | PowerPoint Add-in (Microsoft) |
| PPB | Button bar for print preview (WordPerfect for Windows) |
| PPD | PostScript Printer definition file specification (Adobe Acrobat v.4.0) |
| PPF | Pinnacle Program File (Turtle Beach) |
| PPI | Graphics file (Microsoft PowerPoint) |
| PPL | PolaroidPalettePlus ColorKey device driver (Harvard Graphics 3.0) |
| PPM | Portable Pixelmap bitmap |
| PPO | Pre-processed output file (Clipper 5) |
| PPP | Document or finished project (Parson Power Publisher) |
| PPP | Desktop publishing default output file (Serif PagePlus) |
| PPS | PowerPoint slide show (Microsoft) |
| PPS | ArcView Processing Set Codes |
| PPS | Personal Producer Storyboard |
| PPS | PowerPoint Slideshow |
| PPT | PowerPoint presentation (Microsoft) |
| PPX | Cognos Powerplay portable report (xml format) |
| PQB | Master boot backup file (PowerQuest BootMagic) |
| PQI | Drive image file (PowerQuest) |
| PR2 | Presentation (Aldus Persuasion 2.x) |
| PR2 | Printer driver (dBase IV) |
| PR3 | Postscript printer driver (dBase IV) |
| PR3 | Presentation (Aldus Persuasion 3.x) |
| PRC | Resource (text or program) file (3com PalmPilot) |
| PRD | Printer driver (Generic) |
| PRE | Presentation (Lotus Freelance) |
| PRE | Settings (Programmer's WorkBench) |
| PRE | Settings (Microsoft C/C++) |
| PREL | Adobe Premiere Elements Project |
| PRF | System file (Microsoft Windows) |
| PRF | Settings file (Macromedia Director) |
| PRF | Pixel Run Format graphics (Improces-Fastgraph) |
| PRF | Printer driver (dBase IV) |
| PRF | Output file (Profiler) |
| PRG | Program source files (dBase IV, Clipper 5, and Microsoft FoxPro) |
| PRG | Program source files (Atari) |
| PRG | Program file (WAVmaker) |
| PRI | Printer definitions (LocoScript) |
| PRJ | Project file (3D Studio) (DOS) |
| PRM | MYOB Premier file |
| PRM | Parameter file (Generic) |
| PRN | Print Table (space delimited text) |
| PRND | PageMaker 7.0 file |
| PRN | Windows Printer file (DataCAD) |
| PRN | Printer driver (Signature) |
| PRN | Text file (Lotus 1-2-3-Symphony) |
| PRO | Source code file (Prolog) |
| PRO | Configuration file (Pro/Engineer) |
| PRO | Graphics profile file (DOS) |
| PRO | Project file (Terramodel) |
| PRP | Data conversion saved project file (Oberon Prospero) |
| PRS | Presentation file (Harvard Graphics for Windows) |
| PRS | Printer resource font file (WordPerfect for Windows) |
| PRS | Procedure file (dBase IV) |
| PRT | A print-formatted file |
| PRT | Printer driver (Dr. Halo) |
| PRT | Part file (Pro/Engineer) |
| PRT | Part file (CADkey) |
| PRT | Unigraphics CAD file |
| PRV | Internet provider template file (psiMail) |
| PRX | Compiled program (Microsoft FoxPro) |
| PRZ | Graphics file (Lotus Freelance 97) |
| PS | Postscript-formatted file (a Postscript printer-ready file) |
| PSA | Adobe Photoshop Elements Album |
| PSB | Sound Bank file (Pinnacle) |
| PSD | Bitmap (Adobe Photoshop) |
| PSE | Bitmap graphics (IBM printer Page SEgment) |
| PSF | Outline PostScript printer font (ChiWriter) |
| PSI | A-law audio file (psion) |
| PSM | Studio module (ProTracker) |
| PSM | Sound data file (Epic Pinball) |
| PSM | Symbol table of IDE (Turbo Pascal) |
| PSP | Image file (PaintShop Pro) |
| PSP | Procedure (Prodea Synergy) |
| PSR | Report file (PowerSoft) |
| PST | Personal Folder File (Microsoft Outlook) |
| PT3 | Device driver (Harvard Graphics 3.0) |
| PT3 | Template (PageMaker 3.0) |
| PT4 | Template (PageMaker 4.0) |
| PTB | Peachtree backup file |
| PTB | Script file (PubTech BatchWorks) |
| PTB | Table file (Pro/Engineer) |
| PTD | LiveNote Portable Transcript document |
| PTD | Table file (Pro/ENGINEER) |
| PTF | LiveNote Portable Transcript file |
| PTF | ProTracker Tennis Match file |
| PTL | Petal file (ASCII version of Microsoft Visual Modeler) |
| PTM | Macro (PubTech BatchWorks) |
| PTM | Music module (MOD) (Polytracker) |
| PTN | PaperPort (ScanSoft) thumbnail image index file |
| PTR | QWK reader pointer file (QMail) |
| PTX | RealLegal Portable E-Transcript viewer file |
| PUB | Publication (Ventura Publisher) |
| PUB | Document (Microsoft Publisher) |
| PUB | Public key ring file (PGP) |
| PUD | Map file (WarCraftII) |
| PUT | Compressed archive (PUT) |
| PVD | Script file (Instalit) |
| PVL | Library file (Instalit) |
| PVT | Local pointlist (Fidonet) |
| PW | Text file (Professional Write) |
| PWD | Word document (Microsoft Pocket) |
| PWL | Password list file (Microsoft Windows 9.x) |
| PWP | Image file (a roll of film viewed using Photoworks) |
| PWP | Text document (Professional WritePlus) |
| PWZ | PowerPoint wizard (Microsoft) |
| PX | Primary database index (Paradox) |
| PXW | Pixtran file |
| PXL | Pocket Excel spreadsheet (Microsoft) |
| PY | Saved emessages (YAHOO) |
| PY | python Script file |
| PYC | python Compiled script file |
| PZD | Default settings (Pizazz Plus) |
| PZO | Overlay file (Pizazz Plus) |
| PZP | Palette (Pizazz Plus) |
| PZS | Settings (Pizazz Plus) |
| PZT | Transfer file (Pizazz Plus) |
| PZX | Swap file (Pizazz Plus) |
| P3 | Project Planner file (Primavera) |
| P10 | Plot 10 drawing (Tektronics) |
| P16 | 16 Channel Music file (ProTracker 16) |
| P22 | Patch file (Patch 22) |
| P65 | Document file (PageMaker 6.0) |
| P7C | Digital ID file (MIME) |
| QAD | Document (PF QuickArt) |
| QAG | Quick Access Group data file (Norton Desktop) |
| QAP | Application file (Omnis Quartz) |
| QBE | Saved query (dBase IV) |
| QBE | Saved Query (Quattro Pro) |
| QBO | Compiled query (dBase IV) |
| QBS | Program file (Microsoft QuickBasic) |
| QBM | QuickBooks Portable Company file |
| QBW | Spreadsheet data (QuickBooks for Windows) |
| QCP | Voice file (Qualcomm Pure Voice) |
| QD0 | Data file-segment 10 (Omnis Quartz) |
| QD1 | Data file segment 1 (Omnis Quartz) |
| QD2 | Data file segment 2 (Omnis Quartz) |
| QD3 | Data file segment 3 (Omnis Quartz) |
| QD3D | QuickDraw 3D Metafile (Apple) |
| QD4 | Data file segment 4 (Omnis Quartz) |
| QD5 | Data file segment 5 (Omnis Quartz) |
| QD6 | Data file segment 6 (Omnis Quartz) |
| QD7 | Data file segmnet 7 (Omnis Quartz) |
| QD8 | Data file segment 8 (Omnis Quartz) |
| QD9 | Data file segment 9 (Omnis Quartz) |
| QDF | Data file (Quicken) |
| QDK | Backup of startup files (QEMM) |
| QDT | Data file from the Quicken UK Accountancy/Tax/Invoice program (QuickBooks) |
| QDV | Graphics file (Steve Blackstock Giffer) |
| QEF | Query file (Microsoft Excel) |
| QEL | Electronic library file (Quicken) |
| QFL | Document (FAMILY LAWYER) |
| QFX | Fax (QuickLink) |
| QIC | Backup file (Microsoft) |
| QIF | Image (MIME)(QuickTime) |
| QIF | Import file (Quicken) |
| QLB | Library file (Quick) |
| QLB | Library file (Microsoft C/C++) |
| QLC | Data (PostScript help file) |
| QLP | Printer driver (QuickLink) |
| QM | Motion file (Quality) |
| QM4 | Option or services file (QMail 4.x Mail Door) |
| QPR | Generated query program (Microsoft FoxPro) |
| QPR | Print queue device driver (OS/2) |
| QPX | Compiled query program (Microsoft FoxPro) |
| QQT | Qardware definition file (Quick Qard Technology) |
| QRP | Report builder file (Centura) |
| QRP | Report file (Liberty for Windows 2.0) |
| QRS | Equation Editor support file (WordPerfect for Windows) |
| QRT | QRT graphics file (Ray Tracer) |
| QRY | Query (Microsoft) |
| QRY | Query (dBase IV) |
| QSD | Datafile (Quicken) |
| QST | Tab file (Quake Spy) |
| QT | Movie file (QuickTime) |
| QTI | Image file (QuickTime) |
| QTIF | Image file (QuickTime) |
| QTM | Movie file (QuickTime) |
| QTP | Preferences file (QuickTime) |
| QTS | PICT image file (Macintosh) |
| QTS | Image file (QuickTime) |
| QTX | Image file (QuickTime) |
| QUE | CuteFTP Queue File |
| QUE | Perseus Development Corporation SurveySolutions Questionnaire |
| QW | Write program file (Symantec Q&A) |
| QWK | Message file (QWK Reader) |
| QXD | Data file (QuarkXpress) |
| QXL | Element library (QuarkXpress) |
| QXP | Project file (replaces QXD file as of QuarkXPress 6) |
| QXT | Template file (QuarkXpress) |
| R | Ratfor file (FORTRAN Preprocessor) |
| R | Resource file (Pegasus Mail) |
| RA | RealMedia streaming audio file |
| RAD | Radar data file (Radar ViewPoint) |
| RAM | RealMedia metafile |
| RAO | ReadAllOver (YOUniverse) |
| RAR | Java JCA Resource Adapter Module |
| RAR | WinRAR Compressed Archive |
| RAS | Bitmap (Sun Raster Images) |
| RAT | Datafile (RATS) |
| RAV | Rave file (used by programmers) |
| RAV | Norton Antivirus file |
| RAW | Raw File Format (bitmap) |
| RAW | Raw signed PCM data |
| RAW | Raw signed PCM data |
| RBF | Datafile (Rbase) |
| RBH | Maintained by RoboHELP, the RBH file adds to the information contained in the Help project file |
| RC | Resource script (Micosoft C/C++) |
| RC | Resource script (Borland C++) |
| RC | Configuration file (emacs) |
| RCG | Newsgroup file (Netscape) |
| RD1 | Registered level file (Descent1) |
| RDF | Resource Description Framework file (related to XML and metadata) |
| RDF | Compiled UIC source code (Geoworks UI Compiler) |
| RDF | Research document information format |
| RDI | Device-independent bitmap file |
| RDL | Registered Level file (Descent) |
| RDX | Datafile (Reflex) |
| RDZ | RemoteDocs compressed and encrypted file |
| REC | Datafile (EpiInfo) |
| REC | Recorded macro (Microsoft Windows 3.x) |
| REC | Voice file (RapidComm) |
| REC | Record file (Sprint) |
| RED | Path information file (Clarion Modula-2) |
| REF | Reference file (Generic) |
| REG | Registration file |
| REG | Registration file (Corel) |
| REG | OLE registration file (Microsoft Windows 3.x) |
| REM | Remarks file (Generic) |
| REP | Reply file (QWK Reader) |
| REP | Report file (Visual dBase) |
| REP | Report file (Report Designer) |
| REP | Report file (DataBoss) |
| REP | Report file (CodeReporter) |
| REQ | Request file (Generic) |
| RES | Resource file (Microsoft Visual C++) |
| RES | Compiled resource file (Borland C++) |
| RES | Resource file (dBase IV) |
| REV | Revision file (GeoWorks) |
| REX | Source code file (REXX) |
| REX | Report definition (Oracle) |
| REZ | Resource file (Generic) |
| RF | Raster graphics file (Sun) |
| RFT | Revisable Form Text (part of IBM's DCA or Document Content Architecture) |
| RGB, SGI | RGB files (Silicon Graphics) |
| RGX | Symbol tables (ReaGeniX code generator) |
| RH | Resource header file (Borland C++ 4.5) |
| RI | Data file (Lotus 1-2-3) |
| RIB | Graphics in Renderman format (3DReality) |
| RIC | Fax document (Ricoh) |
| RIF | RIFF bitmap graphics (Fractal Design Painter) |
| RIF | Image file (Metacreations Painter 5) |
| RIP | Graphics (remote access) |
| RIX | Bitmap graphics (ColorRIX VGA Paint) |
| RL1 | Regestered level file (Descent1) |
| RL2 | Registered level file (Descent2) |
| RL4 | Bitmap graphics file |
| RL8 | Bitmap graphics file |
| RLA | Wavefront raster image (SDSC Image Tool) |
| RLB | Data file (Harvard Graphics Win 9.x) |
| RLC | Graphics file (1 bit per pixel scanner output file) |
| RLE | Run-Length Encoded bitmap (SDSC Image Tool) |
| RLZ | Realizer source code file (CA-Realizer) |
| RM | Video file (RealAudio) |
| RMB | RegistryMaster branch |
| RMD | Document (Microsoft RegMaid) |
| RMF | Rich Map Format (used by 3-D game editors to store a map) |
| RMF | Rich music format (Beatnik) |
| RMI | MIDI music |
| RMK | Makefile (Clipper RMake) |
| RMVB | RealVideo Variable Bit Rate File |
| RPS | Borland Translation Repository |
| RN | Xpl Program file (Nota Bene) |
| RND | Rendering slide (AutoCAD-AutoShade) |
| RNO | Runoff file (VAX) |
| ROL | FM music Adlib Music file (Roland) |
| ROM | Cartridge-based home video game emulator file (exact copy of ROM contents in cartridges from Atari 2600, Colecovision, Sega, Nintendo, etc.; not interchangeable between emulators) |
| ROV | Data file (Rescue Rover) |
| ROQ | Id software game file |
| RPD | Database (RapidFire) |
| RPL | Text document (Replica) |
| RPL | Video file (Tomb Raider) |
| RPM | Package Manager (RedHat Linux) |
| RPT | Crystal Reports file ( and a sub-set of Microsoft Visual Basic) |
| RRS | Saved game file (Ace Road Rash) |
| RS | Datafile (Amiga Resource Reassembler) |
| RSB | Red Storm bitmap (Rainbow 6 (Game) and several image editing programs) |
| RSC | Resource file (Generic) |
| RSL | Paradox 7 reports (Broderland) |
| RSM | Resume file (WinWay Resume Writer) |
| RSP | Response file (Generic) |
| RS_ | Resource fork file (Macintosh Mac-ette) |
| RTC | Rich Text Compressed file |
| RTF | Rich Text Format document |
| RTF | Help file script (Microsoft Windows 9.x) |
| RTL | Run Time library (NU 7.0) |
| RTM | Music module (MOD) (Real Tracker) |
| RTK | Used by RoboHELP to simulate the search feature of Windows help |
| RTL | Text file (Generic) |
| RTP | Software update package data file (RTpatch) |
| RTS | RTSL document (RealAudio) |
| RTS | Runtime library file (CA-Realizer) |
| RTS | RoboHELP to speed complex operations |
| RUL | Extension used in InstallShield |
| RUN | Compiled output p-code file (Softworks basic compiler) (SoftworksLtd) |
| RVP | Scan Configuration file (MIME) (Microsoft) |
| RVW | Review file (Generic) |
| RWS | Resource Workshop data file (Borland C++) |
| RWX | Script file (RenderWare) |
| RXX | RAR compressed files from a multi-volume archive (xx = a number from 01 to 99) |
| R8 | Raw graphics (One byte per pixel) plane one (PicLab) |
| R8P | Pcl 4 bitmap font (Intellifont) |
| S | Assembler source code (Unix) |
| S | Source code file (Scheme) |
| SAI | Encrypted video file (Integrated Sensors) |
| SAL | Datafile (SORITEC) |
| SAM | Document (AMI Professional) |
| SAM | Signed 8bit sample data file |
| SAR | Compressed archive (SAR) |
| SAS | SAS program file |
| SAS7BCAT | SAS system catalog |
| SAS7BDAT | SAS system data set |
| SAS7BNDX | SAS system index |
| SAV | Saved game file (Generic) |
| SAV | Backup file (Generic) |
| SAV | Configuration file (Generic) |
| SAVE | Doom 3 and Quake 4 Savegame File |
| SB | Raw Signed Byte (8bit) audio data |
| SBD | Storyboard data file (Storyboard Editor) |
| SBD | Data definition file (Superbase) |
| SBF | File data (Superbase) |
| SBI | Instrument file (Creative Labs SoundBlaster) |
| SBK | Bank file (Soundblaster)/EMU SoundFont v1.x (Creative Labs Soundfont 1.0) |
| SBL | Flash object (ShockWave) |
| SBP | Dml program file (Superbase 4) |
| SBP | Program file (Superbase) |
| SBQ | Query definition file (Superbase) |
| SBR | Support file (Source Browser) |
| SBT | Notes related to record data (Superbase 4 for Windows) |
| SBV | Form definition file (Superbase) |
| SB! | Locking file (Superbase) |
| SC | Pal script (Paradox) |
| SC | Display driver (Framework II) |
| SC2 | Schedule+ 7.0 file (Microsoft) |
| SC2 | SAS 6.12 catalog (Windows 95/NT, OS/2, Mac) |
| SC3 | Saved game file (SIMM City 3000) |
| SC3 | Renamed dBase III screen mask file (dBase IV) |
| SC3 | Screen device driver (Harvard Graphics 3.0) |
| SC4 | Level file (Roller Coaster Tycoon) |
| SC7 | SAS 8.2 catalog |
| SCA | Datafile (SCA) |
| SCC | Source Safe file (Microsoft) |
| SCC | Text file (Generic) |
| SCD | Slide image (Matrix/Imapro SCODL) |
| SCD | Object description language graphics (Scodl Scan Conversion) |
| SCD | Datafile (Microsoft Schedule+ 7.0) |
| SCF | Command file (Microsoft Windows Explorer) |
| SCF | Multimedia show (ScoreMaker) |
| SCF | Spell checker configuration file (Symphony) |
| SCH | Datafile (Microsoft Schedule+ 7.0) |
| SCH | Schematics file (ORCAD) |
| SCI | Inspire native format (ScanVec) |
| SCI | System configuration information file (Generic) |
| SCI | Fax document (SciFAX) |
| SCM | Scheme source code file (Generic) |
| SCM | Video game console ROM emulater file |
| SCN | Scene data file (TrueSpace2) |
| SCN | Screen file (Kermit) |
| SCN | Videowave Scene file |
| SCO | High score file (Generic game file) |
| SCP | Dial-Up Networking Script |
| SCP | Script file (BITCOM) |
| SCR | Screensaver file (Microsoft Windows 9.x) |
| SCR | Fax image (Generic) |
| SCR | Debug source code (DOS Debug) |
| SCR | Screen snapshot file (dBase IV) |
| SCR | Screen snapshot file (Procomm Plus) |
| SCR | Screen font file (LocoScript) |
| SCT | SAS catalog (Dos) |
| SCT | CT bitmap (Scitex) |
| SCT | FoxPro forms (Microsoft) |
| SCT01 | SAS catalog (Unix) |
| SCTP | Applescript script |
| SCV | CASmate Native format (ScanVec) |
| SCX | FoxPro forms (Microsoft) |
| SCX | Bitmap graphics (ColorRIX) |
| SCX | Chart (Stanford Chart) |
| SCX | Screen file (Microsoft FoxPro) |
| SCY | Security file (ReaGeniX) |
| SD | Audio (Sound Designer I) |
| SD2 | Flattened file/data fork (Sound Designer II) |
| SD2 | SAS 6.12 data set (Windows 95/NT OS/2, Mac) |
| SD7 | SAS 8.2 data set |
| SDA | File archive description (Fidonet Software Distribution Network) |
| SDC | Spreadsheet (Staroffice)(StarCalc) |
| SDD | Presentation file (Staroffice)(Starimpress) |
| SDF | System Data File Format - legacy Unisys (Sperry) format |
| SDI | Software distribution network information file |
| SDK | Floppy disk image (Roland) |
| SDL | Library file (SmartDraw) |
| SDN | Software distribution network compressed archive |
| SDP | Datafile (Cocreate SolidDesigner) |
| SDPC | Datafile (Cocreate SolidDesigner) |
| SDR | Drawing (SmartDraw) |
| SDS | Raw Midi Sample Dump Standard file |
| SDT | Template (SmartDraw) |
| SDV | Semicolon Divided Values file |
| SDW | Graphic file (Lotus WordPro) |
| SDW | Raw Signed DWord (32bit) data |
| SDX | Midi Sample Dump Standard files compacted by SDX |
| SEA | Self-expanding archive (used by Stuffit for Mac files and possibly by others) |
| SEC | Secret key ring file (PGP) |
| SEC | Secured animation file (Disney Animation Studio) |
| SED | Screen editor script files (SED) |
| SEL | Data file (Copy Books) |
| SEP | Tagged Image File Format (TIFF) bitmap |
| SEP | Printer seperator page (Generic) |
| SEQ | Animation file (Atari) |
| SEQ | Sequential instruction file (Bubble Chamber) |
| SES | Session file (Cool Edit) (common digital audio editor file ) |
| SES | Session information file (Clarion Modula-2) |
| SESSION | Internet Security Scanner file (ISS) |
| SET | Configuration file (1st Reader) |
| SET | Install driver sets (Symphony) |
| SET | Setup option file (Generic) |
| SET | Voice set files (Quartet) |
| SEW | Sewing program file (Generic) |
| SF | SoundFile format (IrCam) |
| SF | Wps attribute storage file (OS/2 WorkPlace Shell) |
| SF2 | SoundFont file (EMU version 2.0) |
| SF2 | Bank file (Creative Labs Soundfont 2.0)(Soundblaster) |
| SFD | Sound File Data (SoundStage) |
| SFI | Sound File Info (SoundStage) |
| SFI | Graphics file (SIS Framegrabber) |
| SFI | Printer font file (Hewlett-Packard Laser Jet Landscape) |
| SFI | Printer font file (Ventura Publisher) |
| SFK | Sound file (Sonic Foundry) |
| SFL | Pcl 4 bitmap font (LandScape) |
| SFL | Pcl 4 bitmap font (Ventura Publisher) |
| SFL | Pcl 4 bitmap font (Intellifont) |
| SFN | Font file (SPX) |
| SFP | Pcl bitmap font (Portrait) |
| SFP | Pcl bitmap font (Intellifont) |
| SFP | Pcl bitmap font (Ventura Publisher) |
| SFR | Sample Resource (Sonic Foundry) |
| SFS | Pcl 5 scalable font file (Intellifont) |
| SFT | ChiWriter Screen Font |
| SFT | SoftGrid Program Package Container |
| SFW | Mangled JPEG (Seattle Filmworks) |
| SFX | Self-extracting archive (RAR) |
| SG | Image file (SnapGraphix) |
| SG1 | Graphics file (Stanford Graphics) |
| SGF | Document w/graphics (StarWriter) |
| SGF | Graphics file (Sonique) |
| SGI | Graphics file (IRIS) |
| SGI | Graphics file (Silicon Graphics) |
| SGML | Standard Generalized Markup Language |
| SGP | Statistics file (STATGRAPHICS Plus) |
| SGT | Save/Get keyboard macro (Signature) |
| SH | Shell script (Unix) |
| SH | ASCii archive (Unix/SHAR) |
| SH3 | Presentaion file (Harvard Graphics) |
| SHB | Presentation (Corel Show) |
| SHB | Document shortcut file |
| SHG | Bitmap (HotSpot) |
| SHK | Compressed Apple archive (SHRINKIT) |
| SHK | Compressed archive (Arthurian Shrink Archiver) |
| SHM | Shell macro (WordPerfect for Windows Library) |
| SHN | Audio compression file (Shorten) |
| SHP | DOS shapes file (3D Studios) |
| SHP | File format used by some programs for 3D modeling of multipart interactive triangle models |
| SHP | Shapefile spatial data format (used by many GIS programs) |
| SHP | Source code and shape file for text fonts (AutoCAD) |
| SHR | File archive (Unix ASCii) (SHAR) |
| SHS | Shell scrap file; reportedly used to send "password stealers" |
| SHT | Pocket Spreadsheets file |
| SHTML | HTML file containing Server Side Includes (SSI) |
| SHW | Presentation (Corel Show) |
| SHW | Presentation (Harvard Graphics 2.0) |
| SHW | Slide Show (WordPerfect for Windows) |
| SHX | Shape entities (AutoCAD) |
| SHX | Shapefile spatial index file (ArcView) |
| SIF | Setup installation files (Microsoft Windows NT) |
| SIG | PrintMaster graphics file |
| SIG | Signature file (PopMail) |
| SIG | Current program settings (Signature) |
| SIK | Backup files (Microsoft Word for Windows) |
| SIK | Backup files (Sicherungskopie) |
| SIT | Compressed archive of Mac files (Stuffit) |
| SIZ | Configuration file (Oracle 7) |
| SIZED | Gallery resized photo image |
| SKA | Secret Keyring file (PGP) |
| SKF | Drawing file (AutoSketch) |
| SKL | Resource file (Macromedia Director) |
| SL | Save Layout extension (PACT) |
| SL | Source code file (S-Lang) |
| SLB | Slide Library File (AutoCAD) |
| SLC | Compiled SALT script (Telix) |
| SLD | Slide File (AutoCAD) |
| SLDASM | SolidWorks Assembly File |
| SLDDRW | SolidWorks Drawing File |
| SLDPRT | SolidWorks Part File |
| SLI | Slide file (MAGICorp Slide Service) |
| SLK | Symbolic link spreadsheet (SLYK) |
| SLL | Sound data file (Generic) |
| SLT | Script application language (SALT) (Telix script source) |
| SM | Source code file (Smalltalk) |
| SM | Maillist (SoftSpoken Mailer) |
| SM | Script file (ScriptMaker) |
| SM | Simple MODRATEC Graphic |
| SM | Text file (Samna Word) |
| SM3 | Symbol file (DataCAD) |
| SMD | Video game console ROM emulator file |
| SMF | Fax document (SMARTFAX) |
| SMK | Image file (Deer's Revenge) |
| SMK | Image file (Smack Player) |
| SMK | Image file (Nascar Racing '99) |
| SMM | Macro (AMI Pro) |
| SMP | Samplevision format |
| SMP | Sample file (AdLib Gold) |
| SMS | Emulator ROM image file (8-bit Sega Master System) |
| SMT | Text file (Smart Ware II) |
| SMT | SmartObject file (IconAuthor) |
| SMW | Simpl Windows for Crestron processors |
| SMZIP | Stepmania package format |
| SNA | Drive Snapshot compressed Disk Image file |
| SND | Sound file (NeXt) |
| SND | Sound resource (Macintosh) |
| SND | Raw unsigned PCM data |
| SND | Sample (AKAI MPC) |
| SNDR | Sound file (Sounder) |
| SNDT | Sound file (SndTool) |
| SNG | Midi song file (Midisoft Studio) |
| SNG | Midi song file (Prism) |
| SNM | Mailbox (mail folder) index (Netscape) |
| SNO | Source code file (Snobol4) |
| SNP | Microsoft Access database snapshot file |
| SNP | Output video file (Computer Eyes) |
| SO | Shared library file (Unix)(equivalent to a Windows DLL) |
| SOL | Solution file (Common used with game examples,tutorials) |
| SOM | Network serial numbers (Quattro Pro) |
| SOM | Sort information files (Paradox) |
| SON | Song file (Creative Labs SoundBlaster Studio II) |
| SOU | Sound file (Creative Labs SoundBlaster Studio) |
| SP | Compressed archive for Unix (Sprint) |
| SP2 | Quake2 pcx 8-bit sprite builder file |
| SP3 | Quake2 pcx 32-bit sprite builder file (for use with CyberPunkQE) |
| SP4 | Saved game (Roller Coaster Tycoon) |
| SPA | FutureSplash Flash file (Macromedia) |
| SPC | Program file (Microsoft MultiPlan) |
| SPC | Temporary file (WordPerfect for Windows) |
| SPD | Data file (Speech) |
| SPD | Scalable font (Speedo) |
| SPD | Scalable font (Harvard Graphics 3.0) |
| SPF | Slide presentation file (EnerGraphics) |
| SPG | Glossary file (Sprint) |
| SPI | Graphics file (Siemens Scanner) |
| SPI | Graphics file (Phillips Scanner) |
| SPL | Object file (ShockWave Flash) |
| SPL | Sample file (DigiTracker) |
| SPL | Compressed archive (SPLINT) |
| SPL | Customized printer driver (Sprint) |
| SPL | Personal spell dictionary (Signature) |
| SPL | Printer spool file (Microsoft Windows 3.x) |
| SPL | Sample file (Generic) |
| SPM | Data file (WordPerfect for Windows) |
| SPP | Printer file (Sprint) |
| SPPACK | Sound sample (SP Pack) |
| SPR | Document letter (Sprint) |
| SPR | Generated screen program (Microsoft FoxPro) |
| SPR | Sprite (Image layering and resizing) |
| SPRITE | Bitmap file (Acorn) |
| SPS | Spssx source code file (VAX/VMS) |
| SPS | Screen driver (Sprint) |
| SPT | Source code file (Spitbol) |
| SPT | Support file (MITAC disk/system management utility package) |
| SPU | Picture file (Spectrum 512) |
| SPW | Worksheet (SigmaPlot) |
| SPX | Compiled screen program (Microsoft FoxPro) |
| SPZ | SudoKoach puzzle |
| SQC | Structured Query Language (SQL) common code file |
| SQL | SQL queries (Informix) |
| SQL | Generally used by database products as an extension for SQL queries (scripts, text, or binary) |
| SQP | Query result of audio search (Sonique) |
| SQR | Structured Query Language (SQL) program file |
| SQZ | Compressed archive (SQUEEZE) |
| SPZ | SudoKoach puzzle file |
| SRE | Undefined file (Motorola) |
| SRF | Raster graphics file (Sun) |
| SRM | Video game console ROM emulator file |
| SRP | SCript file (QuickLink) |
| SRZ | Source file (DataFlex) |
| SS | Bitmap graphics (Splash) |
| SS4 | MODRATEC SigScribe4 Railway Signal Interlocking Design Data File |
| SS5 | MODRATEC SigScribe5 Railway Signal Interlocking Design Data File |
| SSA | Video file (Sub Station Alpha) |
| SSD | Datafile (SAS/PC) |
| SSD01 | SAS data sets (Unix) |
| SSD | SAS database (Dos) |
| SSF | Spreadsheet file (Enable) |
| SSP | Datafile (SAS Transport) |
| SSV | Quake 2 Savegame File |
| ST | Source code file (Little SmallTalk) |
| ST | Instrument library (Scream Tracker) |
| ST | Disk Image file (Atari) |
| ST | Stamp file (NeoPaint) |
| STA | Saved state (Reflection 4.0) |
| STA | Stack file (SpinMaker Plus) |
| STB | Stub library (Genus GX Kernel) |
| STD | StarOffice Drawing Template |
| STD | State transition diagram graphic file (Prosa) |
| STD | Standard script file (LocoScript) |
| STF | Compressed archive (SHRINKTOFIT) |
| STL | Stereolithography file |
| STM | Shorter suffix for .shtml, an HTML file containing a server side include (SSI) |
| STM | Music module (MOD) (Scream Tracker 2) |
| STM | State transition diagram model file (Prosa) |
| STM | Music file (Scream Tracker) |
| STO | Pascal stub OBJ file (Genus GX Kernel) |
| STP | Catia file |
| STQ | Text file (Statistica) (StatSoft Software) |
| STR | Screensaver file |
| STR | Structure list OBJ file (dBase IV Application Generator) |
| STS | Project status information file (Microsoft C/C++) |
| STS | Song file (Music) (Scream Tracker) |
| STT | Taci Pixia palette file |
| STY | Style sheet (Ventura Publisher) |
| STW | Data file (SmartTerm for Windows) |
| STW | OpenOffice.org 1.0 Text Document Template |
| STX | Electronic book file (SmarText) |
| STX | Tax form (CA-Simply Tax) |
| STY | Style sheet (Generic text and graphics programs0 |
| SUI | Suit library (Simple User Interface Toolkit) |
| SUM | Summary file (Generic) |
| SUN | Rasterfile graphics (Sun) |
| SUP | Supplementary dictionary files (WordPerfect for Windows) |
| SVD | Autosave file for document (WordPerfect for Windows) |
| SVF | Simple Vector Format 2D image (Microstation) |
| SVG | Autosave file for glossary (WordPerfect for Windows) |
| SVG | Scalable vector graphics file (Adobe) |
| SVG | Return To Castle Wolfenstein Savegame File |
| SVP | Graphics file (Sonique) |
| SVS | Autosave file for style sheet (WordPerfect for Windows) |
| SVX | Sound file (Amiga 8SVX) |
| SVX | Interchange file format, 8SVX/16SV |
| SVY | Database file (SAVVY/PC) |
| SW | Raw signed Word (16bit) data |
| SWA | Shockwave audio file in Macromedia Director (an MP3 file) |
| SWF | Object (ShockWave Flash) |
| SWG | Swag Packet file (SWAG Reader) |
| SWP | Swap file (DataCAD) |
| SWP | Document backup file (Sprint) |
| SWP | Swap file (DOS) |
| SXC | OpenOfficeCalc file |
| SXD | StarOffice Drawing |
| SXW | OpenOffice.org 1.0 Text Document |
| SY1 | Smartpix symbol library (Ami Pro) |
| SY3 | Symbol file (Harvard Graphics 2.0) |
| SYD | Backup of startup files (QEMM) |
| SYLK | Microsoft Excel spreadsheet file |
| SYM | Precompiled header file (Borland C++) |
| SYM | Program symbol table (Generic to compilers) |
| SYM | Symbol file (Harvard Graphics 2.0) |
| SYN | SDSC Synu image file (SDSC Image Tool) |
| SYN | Synonym file (Microsoft Word 5.0) |
| SYS | System file (Generic) |
| SYS | Datafile (SYGRAPH) |
| SYS | Datafile (SYSTAT) |
| SYS | Datafile (SPSS/PC) |
| SYS | System file Device driver or hardware configuration file |
| SYW | Wave file (Yamaha SV-series) |
| SYW | Graphics symbols (Harvard Graphics) |
| S3I | Instrument file (Scream Tracker v 3.0) |
| S3M | 16 channel music file (Scream Tracker v 3.0) |
| S$$ | Temporary sort file (Sprint) |
| T | Source file (TADS) |
| T | Tape archive (TAR) (Without compression) |
| T | Tester symbol file (ReaGeniX code generator) |
| TAB | Table file (MapInfo GIS) |
| TAB | Guitar Tablature file |
| TAG | Query tag name file (DataFlex) |
| TAH | Turbo assembler help file (Borland C++) |
| TAL | Text illustration file (TypeAlign) |
| TAR | Tape Archive |
| TAR | Compressed archive (TAR) |
| TAZ | Gzip/Tape archive (Unix) |
| TAZ | Compressed ASCII archive (TAR) |
| TAZ | Compressed ASCII archive (COMPRESS) |
| TB1 | Font file (Borland Turbo C) |
| TB2 | Font file (Borland Turbo C) |
| TBF | Fax document (Imavox TurboFax) |
| TBK | Interactive multimedia files (Asymetrix Toolbook) |
| TBK | Memo backup file (dBase IV) |
| TBK | Memo backup file (Microsoft FoxPro) |
| TBK | Toolbook file (Asymetrix Toolbook) |
| TBL | Graphics (Native format) (Pagemaker TableEditor) |
| TBL | Table of values (OS/2) |
| TBO | Turbo Architecture Database (used by U.S. Federal Highway Administration's "Turbo Architecture" program) |
| TBS | Text elements (Microsoft Word for Windows) |
| TBX | Table (Project Scheduler 4) |
| TC | Configuration file (Turbo C) |
| TC | Configuration file (Borland C++) |
| TCF | Test Crafter File (storage file for tests developed in Cambridge UP software) |
| TCH | Turbo C Help file (Borland C++) |
| TCL | Script in the TCL/TK Language |
| TCW | Drawing file (TurboCAD for Windows) |
| TD | Configuration file (Turbo Debugger for DOS) |
| TD0 | Disk image file (Teledisk) |
| TD2 | Configuration file (Turbo Debugger for WIN32) |
| TD4 | Saved track design (Roller Coaster Tycoon) |
| TDB | Database file (Thumbs Plus) |
| TDB | Database file (TACT) |
| TDDD | A file format use by the Imagine & Turbo Silver ray-tracers |
| TDF | Font file (TheDraw) |
| TDF | Typeface definition file (Speedo) |
| TDH | Help file (Turbo Debugger0 |
| TDK | Keystroke recording file (Turbo Debugger) |
| TDS | Symbol table (Turbo Debugger) |
| TDW | Configuration file (Turbo Debugger for Windows) |
| TEF | Fax document (Relisys TEFAX) |
| TEL | Hostfile (Telnet) |
| TEM | Turbo Editor Macro Language script (Borland C++) |
| TEM | Input template (IconAuthor) |
| TEX | Texture file |
| TEX | TEX text file (Scientific Word) |
| TEX | Datasheet file (Idealist) |
| TF | Configuration file (Turbo Profiler) |
| TFA | Area file (Turbo Profiler) |
| TFC | Catalogue file (Tobi's Floppy Disk Cataloguer) |
| TFH | Help file (Turbo Profiler) |
| TFM | Form file (Form Tool Gold) |
| TFM | TeX font metrics file (TeX) |
| TFM | Tagged font metric file (TeX) |
| TFS | Statistics file (Turbo Profiler) |
| TFW | ArcView World file for TIF image (GIS application) |
| TG1 | Project file (On Target) |
| TGA | Targa bitmap (Adobe Acrobat,TrueVision) |
| TGA | Targa bitmap (Countour Mortgage Loan Format) |
| TGA | Winpoint Loan file (Microsoft Excel) |
| TGQ | Movie file (Dungeon Keeper 2) (Bullfrog Software) |
| TGV | Video file (Electronic Arts) (Need for Speed I/II/III, NBA '96) |
| TGZ | Gzip/Tape archive (Unix) |
| THAI | Husquvania sewing machine file |
| THEME | Desktop theme (Microsoft Windows 9.x) |
| THM | Thumbnail image file (Microsoft Clip Gallery v.1.x) |
| THN | Thumbnail (Graphics Workshop for Windows) |
| THS | Thesaurus dictionary (WordPerfect for Windows) |
| TIF | Tag image bitmap file (TIFF) |
| TIFF | Tag image bitmap file (TIFF) |
| TIG | Map file (Tiger) (Used by the US Government to distribute Map files) |
| TIL | Fuzzy Logic knowledge base file (Togai InfraLogic Fuzzy-C Compiler) |
| TIM | Texture/Image file (Playstation) |
| TIS | Tile set (MahJongg 3.0) |
| TJF | backup files (VAXTPU Editor) |
| TLB | OLE type library files (Microsoft) |
| TLB | Reference table (Bubble Editor) |
| TLB | Text library (VAX) |
| TLB | Type library (Visual C++) |
| TLC | Compiled tool command language source code file (Swat) |
| TLE | Two-Line element set (NASA) |
| TLP | Project timeline file (Microsoft Project) |
| TLX | Data file (Trellix) |
| TMD | TextMaker document from SoftMaker |
| TMF | Tagged font metric file (WordPerfect for Windows) |
| TMO | Ztg global optimizer default optimizer file (Zortech C++) |
| TMP | Temporary file (Microsoft Windows) (ALL) |
| TMS | Script file (Telemate) |
| TNV | Data file (BitWare) |
| TOC | Table of contents file (Eudora Mailbox) |
| TOL | Image file (Kodak Photo Enhancer) |
| TORRENT | BitTorrent file |
| TOS | The Operation System for Atari line of 16/32 and 32/32 computers |
| TOS | Self-Extracting archive (Atari ST) |
| TP | Configuration file (Turbo Pascal) |
| TP | Sesson-state file (Turbo Profiler) |
| TP4 | Saved picture file (Roller Coaster Tycoon) |
| TPB | Downloadable PCL Soft font file backup (HiJaak) |
| TPF | Downloadable PCL Soft font file (HiJaak) |
| TPH | Help file (Turbo Pascal) |
| TPL | Residents units library (Turbo Pascal) |
| TPL | Template file ( Cakewalk Audio) |
| TPL | Template file (Harvard Graphics 2.0) |
| TPL | Template file (DataCAD) |
| TPL | Encrypted lesson file (TutorPro) |
| TPP | Project file (Teleport Pro) |
| TPP | Protected mode units (Borland Pascal 7.0) |
| TPU | Turbo Pascal Unit (Turbo Pascal)(BGI) |
| TPU | Command file (VAXTPU Editor) |
| TPV | Packed graphics file (TutorPro) |
| TPW | Session-state file (Turbo Profiler for Microsoft Windows) |
| TPW | Packed wave files (TutorPro) |
| TPW | Turbo Pascal Unit (BGI) (Turbo Pascal for Windows 9.x) |
| TPX | Image file (ULead Photo Express) |
| TPZ | Compressed archive (TAR) |
| TPZ | Compressed archive (GNUzip) |
| TP3 | Template file (Harvard Graphics) |
| TR | Session-state settings (Turbo Charge Debugger for DOS) |
| TR2 | Session-state settings (Turbo Charge Debugger for Win32) |
| TRA | Saved game file (Coaster) |
| TRC | Debug support file (Power CTrace) |
| TRE | Directory tree file (PC-Tools) |
| TRK | Script file (Kermit) |
| TRIF | Tiled Raster Interchange Format |
| TRM | Terminal file (Generic) |
| TRM | Terminal settings file (Microsoft Windows 3.x) |
| TRN | Translation support file (Quattro Pro) |
| TRN | Project usage log (MKS Source Integrity) |
| TRS | Executable file (MicroGraphix) |
| TRW | Session-state settings (Turbo Debugger for Windows) |
| TS | HDTV sample file (Transport Stream MPEG-2 video stream) |
| TSH | Broderbund Creatacard Transfer Project |
| TSK | Compaq iPaq picture image |
| TST | Printer test file (WordPerfect for Windows) |
| TSV | Tab-separated values file |
| TTF | TrueType font (Generic) |
| TTK | Translation tool kit file (Corel Catalyst) |
| TTO | Client access data specification file (AS/400) (Server to Client) |
| TUB | Corel Paint Shop Pro Tube File |
| TUV | Tutorial file (Many programs use this suffix for their tutorials) (Generic) |
| TV | Table view settings (Paradox) |
| TV1 | Overflow file above insert point in document 1 (WordPerfect for Windows) |
| TV2 | Overflow file above insert point in document 2 (WordPerfect for Windows) |
| TV3 | Overflow file above insert point in document 3 (WordPerfect for Windows) |
| TV4 | Overflow file above insert point in document 4 (WordPerfect for Windows) |
| TV5 | Overflow file above insert point in document 5 (WordPerfect for Windows) |
| TV6 | Overflow file above insert point in document 6 (WordPerfect for Windows) |
| TV7 | Overflow file above insert point in document 7 (WordPerfect for Windows) |
| TV8 | Overflow file above insert point in document 8 (WordPerfect for Windows) |
| TV9 | Overflow file above insert point in document 9 (WordPerfect for Windows) |
| TVF | Table view settings (dBase IV) |
| TWF | Data file (TABWorks) |
| TWW | Template file (TagWrite) |
| TX8 | MS-DOS text |
| TXB | Encoded briefing file (Descent/D2) |
| TXF | Compressed archive (TAR) |
| TXF | Compressed archive (FREEZE) |
| TXF | Tax exchange format (Quicken and others) |
| TXI | Support file (TeX) |
| TXT | ASCII text-formatted data |
| TXW | Wave file (Yamaha TX16W) |
| TYM | Time Stamp files (PageMaker 4.0) |
| TZ | Old compression file (TAR), (COMPRESS) |
| TZB | Compressed archive (Tar) |
| T2T | Modeling software file (Sonata CAD) |
| T44 | Temporary file for sorting index (dBase IV) |
| T64 | Emulator tape image file (Commodore 64) |
| U | Subsampled Raw YUV Image |
| UAP | User agent profile (Used by wireless telephony applications) |
| UB | Raw unsigned byte (8-bit) data |
| UC2 | Compressed archive (UltraCompressor II) |
| UCN | New compressed archive (UltraCompressor II) |
| UDF | Unique Database (Microsoft Windows NT) |
| UDF | Image filter (Photostyler) |
| UDW | Raw unsigned doubleword (32-bit) data |
| UE2 | Encrypted archive (UltraCompressor II) |
| UFO | Object file (Ulead) |
| UG | Drawing file (AutoCAD and others) |
| UHS | Binary file (Universal Hint System) |
| UI | Espire source code (Geoworks UI Compiler) |
| UI | User interface file (Sprint) |
| UIF | Long prompts for Microsoft Windows (WordPerfect for Windows) |
| UIH | Espire header file (Geoworks UI Compiler) |
| UL | Audio file (ULAW) |
| ULAW | (CCITT G.711) audio (US Telephony) |
| ULD | Uploaded file information (Procomm Plus) |
| ULT | Music module (MOD) (UltraTracker) |
| UMB | Backup file (archive) (MemMaker) |
| UNI | UniMod music module (MOD) (MikMod) |
| UNI | Datafile (Forcast Pro) |
| UNX | Text file (Unix specific information) |
| UPD | Updated program data (Generic) |
| UPD | Updated program data (dBase) |
| UPI | Program file (ULead Photo Impact) |
| UPO | Compiled updated datafile (dBase) |
| UPX | Saved Image file (ULead Photo Express) |
| URF | Universal radar format (Radar ViewPoint) |
| URL | Internet shortcut file (Universal Resource Locator) |
| USA | Unreal II Savegame File |
| USE | Source Integrity file (MKS) |
| USP | Printer font w/updated USACII extended character set (Pagemaker) |
| USR | User database file (Procomm Plus) |
| USR | Audit trail file (Pro/Engineer) |
| USR | User database file (Turbo C++) |
| USR | User database file (Tour) |
| UU | UU-encoded file |
| UU | Compressed ASCII archive (UUDE/ENCODE) |
| UUE | Executable compressed ASCII archive (UUDE/ENCODE) |
| UUE | UU-encoded file |
| UW | Raw unsigned 16-bit) datafile (Word) |
| UWF | Wave file (UltraTracker) |
| V | Consistency check support file (ReaGeniX Code Generator) |
| V | Main image input file (Vivid 2.0) |
| VAL | Validity checks/referential integrity checks (Paradox for Windows) |
| VAL | Values list object file (dBase Application Generator) |
| VAL | Asset management document (Milliplex OmniValue) |
| VAN | Animation file (VistaPro) |
| VAP | Annotated speech file (Generic) |
| VAR | Variable file (IconAuthor) |
| VAR | ASCII text file for data dictionary (Sterling Software Groundworks, COOL Business Team Enterprise Model) |
| VBA | VBase file |
| VBP | Project file (Microsoft Visual Basic) |
| VBR | Remote automated registration file (Microsoft Visual Basic) |
| VBS | Script file (Microsoft Visual Basic) |
| VBW | Workspace file (Microsoft Visual Basic) |
| VBX | Custom control file (Microsoft Visual Basic) |
| VBX | Visual basic extension (Microsoft Visual Basic) |
| VC | Include file with color definitions (Vivid 2.0) |
| VC | Spreadsheet (VisaCalc) |
| VCB | Visual COMMBasic or VCBasic macro definition (created with Outsideview) |
| VCE | Unformatted voice file (used by Cool Edit) |
| VCE | Unformatted voice file (Natural Microsystems) (NMS) |
| VCF | Virtual card file (Netscape) |
| VCF | Virtual card file (Many programs use this extension) |
| VCF | Configuration file; defines objects for use with Sense8's WorldToolKit (Vevi) |
| VCT | Class library (Microsoft FoxPro) (MFC) |
| VCW | Visual workbench information file (Microsoft Visual C++) |
| VCX | Class library (Microsoft FoxPro)(MFC) |
| VDA | Targa bitmap |
| VDA | Graphics image (Generic) |
| VDR | Drawing file (ComputerEasy Draw) |
| VDX | Vector graphic file |
| VDX | Virtual device driver |
| VDX | XML for Visio drawing file |
| VEL | 3D drawing file (CAD( (Ashlar) |
| VEW | View file (Clipper 5) |
| VEW | View file (Lotus Approach) |
| VFL | Clip art file (PrintMaster Gold) |
| VF | Vegas Movie Studio File |
| VFM | Voting form (Voter) |
| VFN | Voting form for customers (VFN) |
| VGA | Video graphics array (Monitor type, also defines if your monitor is compliant with the new (1994) SVGA (Super Video Graphics Array) (SVGA) |
| VGA | Video graphics array (Font type for display on a VGA Monitor) |
| VGD | Visual display driver ( Generic CADD) |
| VGR | Graphics file (Ventura Publisher) |
| VI | Graphics file (Jovian Logic VI) |
| VI | Virtual Instrument file (National Instruments LABView) |
| VIC | Graphics file (Vicar) |
| VID | Shell monitor file (Microsoft DOS v.5) |
| VID | Screen device driver (Microsoft Word) |
| VID | Bitmap graphics (YUV12C M-Motion Frame Buffer) |
| VID | Bethesda video files (Terminator, Future Shock) |
| VIF | Khoros Visualisation image (SDSC Image Tool) |
| VIFF | Khoros Visualisation image (SDSC Image Tool) |
| VIK | Graphics Image (Viking) |
| VIR | File identified as a virus-infected file by Norton AntiVirus and possibly others |
| VIS | Graphics image file (VIS) |
| VIV | Streaming video file (VivoActive) |
| VIZ | dVS/dVISE file (Division) |
| VLB | Library file (Corel Ventura) |
| VLM | Drafting program file (Vellum, by Ashler) |
| VM | Virtual memory file (Geoworks) |
| VMC | Virtual memory configuration file (Adobe Acrobat Reader) |
| VMD | On-line video file (Sierra) (Torin's Passage) |
| VMF | Audio file (FaxWorks) |
| VMF | Font characteristics file (Ventura Publishing) |
| VML | Vector markup language (used by Microsoft Office 2000) |
| VMS | Text file with vms specific information |
| VNC | Virtual Network Computing file used by Real and Tight VNC |
| VO | Include file with object definiton (Vivid 2.0) |
| VOB | Encrypted video and audio files used on current DVD's (Digital Video Disk) |
| VOC | Audio file (Creative Labs Sound Blaster) |
| VOC | Audio file (Quartet) |
| VOC | Audio file (generated by RCA digital voice recorder) |
| VOF | Object folder (VZ Programmer) |
| VOX | Dialogic audio file coded using ADPCM |
| VOX | Formatted voice file (Natural Microsystems) (NMS) |
| VOX | Audio file (Talking Technology) |
| VP | Publication (Ventura Publisher) |
| VPG | Graphics image file (VPGraphics) |
| VQA | Video files (Westwood Studios) |
| VQE | VQ Locator file (Yamaha Sound) |
| VQF | VQ file (Yamaha Sound) (possible emerging standard) |
| VQL | VQ Locator file (Yamaha Sound) |
| VRF | Configuration file (Oracle 7) |
| VRM | Overlay file (Quattro Pro) |
| VRML | A VRML file |
| VRP | Project file (VXRexx) |
| VRS | Video device driver (WordPerfect for Windows) |
| VS | Include file w/surface definition (Vivid 2.0) |
| VSD | Drawing file (flow chart or schematic)(Shapeware Visio) |
| VSL | Download List file (GetRight) |
| VSM | Simulation model (VisSim) |
| VSN | A Windows 9x/NT ViruSafe version file; used to keep information about all the files in a directory; when a file is accessed, information is compared with the VSN information to ensure that they match |
| VSP | Image sprite (SPX) |
| VSP | Data print file (Schedule Soft) |
| VSS | Stencil file (Shapeware Visio) |
| VSS | Smartshapes image file (Shapeware Visio) |
| VST | Targa bitmap (Generic) |
| VST | Bitmap graphic file (TrueVison Vista) |
| VSW | Workspace file (Shapeware Visio) |
| VUE | Animation file (3D Studio) |
| VUE | View file (dBase IV) |
| VUE | View file (Microsoft FoxPro) |
| VW | Text file (Volkswriter) |
| VWP | Audio MetaSound plug-in (VoxWare Audio Compression Toolkit version 2.02.61) |
| VWP | Audio plug-in (Voxware MetaVoice Toolkit) |
| VWR | File viewer (PC Tools) |
| VXD | Virtual device driver (Microsoft Windows 9.x) |
| V8 | 8-bit audio file (CoVox) |
| W | Word chart file (APPLAUSE) |
| W30 | Printer font (AST TurboLaser) |
| W30 | Printer font (Ventura Publisher) |
| W31 | Startup file (Microsoft Windows 3.1) |
| W3L | W3Launch file |
| W44 | Temporary file for Sort or Index (dBase) |
| WAB | Outlook file (Microsoft Outlook, Outlook Express) |
| WAD | Large file for Doom game containing video, player level, and other information |
| WAL | Texture file (Quake 2) |
| WAS | Script source code file (Procomm Plus Aspect) |
| WAV | Waveform sound (Microsoft Windows) |
| WAX | Compiled script file (Procomm Plus Aspect) |
| WB1 | Notebook (QuattroPro for Windows) |
| WB2 | Spreadsheet (QuattroPro for Windows) |
| WB3 | Text file (QuattroPro for Windows) |
| WBC | Image file (Webshots) |
| WBF | Batch file (Microsoft Windows 9.x) |
| WBK | Backup file (Microsoft Word for Windows) |
| WBL | Upload file (Argo Webload II) |
| WBR | WordBar File (Crick Software) |
| WBT | Batch file (WinBatch) |
| WBT | Wordbar template (Crick Software) |
| WBZ | WebShots image |
| WCD | Macro token list file (WordPerfect for Windows) |
| WCF | Webex Saved Chat File |
| WCM | Macro (WordPerfect fdor Windows) |
| WCM | Data transmission file (Microsoft Works) |
| WCP | Product information description file (WordPerfect for Windows) |
| WD1 | Word Express file |
| WD2 | Database file (Info Select) by (Micro Logic) |
| WDB | Database file (Microsoft Works) |
| WDF | WebArt data file (database file that can be converted for use in many programs) |
| WDG | Warftpd remote daemon file |
| WDM | Microsoft Visual InterDev98 templates Web Project Items file |
| WEB | Web document (Corel Zara) |
| WEB | Web source code file |
| WFB | Bank file (Maui/Rio/Monterey) (Turtle Beack WaveFront) |
| WFD | Drum set (Maui/Rio/Monterey)(Turtle Beach WaveFront) |
| WFD | Audio waveform (WaveForm Manager Pro) |
| WFL | Flowchart file (Winflow) |
| WFM | Windows form (Virtual dBase) |
| WFN | Symbol (Corel Draw) |
| WFP | Program file (Turtle Beach WaveFront)(Maui/Rio/Monterey) |
| WFT | Data file (NICOLET (Old Format), see NRF) |
| WFX | Data file (WinFax) |
| WG1 | Worksheet (Lotus 1-2-3/G) |
| WG2 | Worksheet (Lotus 1-2-3 for O/S2) |
| WGP | Data file (Wild Board Games) |
| WI | Wavelet compressed bitmap (Corel) |
| WID | Width table (Ventura Publisher) |
| WIF | Wavelet image file (see WI) |
| WIL | WinImage file |
| WIM | Wireless identity module (Used by wireless application protocols) |
| WIN | Window file (Microsoft FoxPro) |
| WIN | Window file (dBase) |
| WIN | Window preference file (Pro/Engineer) |
| WIS | Script file (Reynolds & Reynolds) (Stores the results of a database query) |
| WIZ | Wizard file (Microsoft Word) |
| WIZ | Page wizard (Microsoft Publisher) |
| WK1 | Spreadsheet (Lotus 1-2-3 v. 1 and 2) |
| WK3 | Spreadsheet (Lotus 1-2-3 v. 3) |
| WK4 | Spreadsheet (Lotus 1-2-3 v. 4) |
| WKB | Document file (WordPerfect for Windows) |
| WKE | Spreadsheet (Lotus 1-2-3 Educational version) |
| WKQ | Spreadsheet (Quattro Pro) |
| WKS | Spreadsheet (Symphony 1.0) |
| WKS | Worksheet spreadsheet (Lotus 1-2-3) |
| WKS | Document (Microsoft Works) |
| WKS | Workspace file (Xlisp) |
| WLD | REND386/AVRIL file |
| WLF | Upload file (Argo Upload I) |
| WLK | Graphics file (Virtus Walkthrough) |
| WLL | Add-In file (Microsoft) |
| WMA | Audio file in Microsoft Windows Media format (Can be changed to ASF) Siren (Sonic Foundry) |
| WMC | Backup files for startup (MathCAD for Windows) |
| WMC | Macro file (WordPerfect for Windows) |
| WMC | Text file (WordMARC) |
| WMF | Metafile (Microsoft Windows) |
| WMV | Windows Media Player visual/audio file |
| WMZ | Windows Media Player skins file |
| WN | Text file (NeXT WriteNow) |
| WNF | Outline font description file (CorelDRAW) |
| WOA | Swap file (Microsoft Windows 3.x) |
| WOC | Organization chart (Microsoft Windows OrgChart) |
| WORKFLOW | Automator workflow |
| WOW | Music module (MOD) (Grave Composer) |
| WP | Document file (WordPerfect for Windows) |
| WPA | Word processor document (ACT!) |
| WP4 | Document (WordPerfect for Windows 4.0) |
| WP5 | Document (WordPerfect for Windows 5.0) |
| WP6 | Document (WordPerfect for Windows 6.0) |
| WPD | Demo file (WordPerfect for Windows) (ALL) |
| WPD | Document (WordPerfect for Windows) |
| WPF | Document (Enable) |
| WPF | Fax document (WorldPort) |
| WPF | Form file (WordPerfect for Windows) |
| WPG | Microsoft Word for Windows vector graphics (DrawPerfect) |
| WPG | Graphics file (Microsoft Word for Windows) |
| WPK | Macro (Microsoft Word for Windows) |
| WPM | Macro (Microsoft Word for Windows) |
| WPS | Rockbox Theme |
| WPS | MS Works Text Document |
| WPT | Template (Microsoft Word for Windows) |
| WPW | PerfectWorks document (Novell) |
| WQ! | Compressed spreadsheet (QuattroPro) |
| WQ1 | Spreadsheet (QuattroPro/DOS) |
| WQ2 | Spreadsheet (QuattroPro version 5) |
| WR1 | Symphony file (Lotus) |
| WR1 | Spreadsheet (Symphony 1.1-2) |
| WRAP | MediaForge (XMLAuthor) media content file |
| WRD | Template (Charisma) |
| WRG | ReGet document |
| WRI | Write document (Windows Write) |
| WRK | Project file (CakeWalk Music Audio) |
| WRK | Spreadsheet (Symphony 1.0) |
| WRL | Virtual Reality model |
| WRP | Compressed Amiga archive (WARP) |
| WRP | 3D modeling file (Raindrop Geomagic) (Scandata) |
| WRS | Resource file (Microsoft Word for Windows) |
| WRZ | Another VRML fileject |
| WS | Text file (WordStar) |
| WS1 | Document (WordStar for Windows version 1) |
| WS2 | Document (WordStar for Windows version 2) |
| WS3 | Document (WordStar for Windows version 3) |
| WS4 | Document (WordStar for Windows version 4) |
| WS5 | Document (WordStar for Windows version 5) |
| WS6 | Document (WordStar for Windows version 6) |
| WS7 | Document (WordStar for Windows version 7) |
| WSD | Document (WordStar for Windows 2000) |
| WSP | WorkSpace file (Fortran PowerStation) |
| WST | Document (WordStar for Windows) |
| WSZ | Skin (WinAmp) |
| WTA | Used by wireless telephony applications |
| WV | WavPack lossless compressed audio file |
| WVL | Wavelet Compressed Bitmap |
| WVW | Interleaf WorldView format (a PDF format) |
| WWB | Button bar for document window (WordPerfect for Windows) |
| WWK | Keyboard layout file (WordPerfect for Windows) |
| WWL | Add-in file (Microsoft Word) |
| WXD | Music resource file (Relic Entertainment)(Home World) |
| WXP | Document file (EXP for Microsoft Windows) |
| X | AVS image (SDSC Image Tool) |
| X | Source code file (Lex) |
| XAR | Corel Xara drawing |
| XBM | A MIME 'X11" bitmap image |
| XCF | GIMP document |
| XCI | XML Configuration Information (Adobe enterprise forms product) |
| XDL | XML Schema file |
| XEF | XGenics eManager XML form and data for eManager |
| XEM | XGenics eManager Metered units / credit definition for forms/file usage in eManager |
| XEP | XGenics eManager File packaging / unpacking information for eManager components |
| XES | XGenics eManager XML definition for UI skins |
| XET | XGenics eManager XML definition for eManager process |
| XEV | XGenics eManager File download definition for autoupdate and delivery of new procedures |
| XEZ | XGenics eManager Template package for eManager |
| XFD | Acu4GL/ACUCOBOL extended file description (from Acucorp) |
| XFN | Printer font file (Xerox) |
| XFN | Printer font file (Ventura Publisher) |
| XFT | Printer font file (24 Pin) (ChiWriter) |
| XFT | XML Forms Template (from Adobe enterprise forms products such as Adobe Forms Designer) |
| XFX | Fax Document (Various) |
| XHTML | eXtensible hypertext markup language |
| XI | Instrument sample file (ScreamTracker) |
| XI | Instrument file (FastTracker II) |
| XIF | Wang imaging file (Included with Windows 95) |
| XIF | Image file (Xerox) (same as TIF) |
| XIF | Image file (Pagis) |
| XIF | Image file eXtended (ScanSoft) the file is similar to TIFF and is a (Pagis) native format |
| XLA | Add-in file (Microsoft Excel) |
| XLA | Archive (Xlib) |
| XLB | Toolbar file (Microsoft Excel) |
| XLB | Datafile (Microsoft Excel) |
| XLC | Chart file (Microsoft Excel) |
| XLD | Dialogue file (Microsoft Excel) |
| XLK | Backup file (Microsoft Excel) |
| XLL | Add-in file (Microsoft Excel) |
| XLL | Dynamic link library (Microsoft Excel) |
| XLM | Macro file (Microsoft Excel) |
| XLR | Microsoft Works spreadsheet or chart |
| XLS | Worksheet file (Microsoft Excel) |
| XLT | Template file (Microsoft Excel) |
| XLT | Translation table (Lotus 1-2-3) |
| XLT | Translation table (Symphony) |
| XLT | Translation table (Procomm Plus) |
| XLV | VBA module (Microsoft Excel) |
| XLW | Workbook (Microsoft Excel) |
| XM | Music module (MOD) (Fast Tracker 2) |
| XMI | Compressed midi music (eXtended) |
| XML | eXtensible markup language |
| XNF | Network file (Standard) |
| XNK | Shortcut file (Microsoft Exchange) |
| XON | Datafile (Axon) |
| XPM | X BitMap format |
| XQT | Executable file (Waffle) |
| XQT | Macro file (SuperCalc) |
| XXX | XXXX |
| XR1 | Data file (Epic Megagames Xargon) |
| XRF | Cross-reference file (Generic) |
| XSX | Schema view layout description file (Microsoft XML Designer) |
| XTB | External translation table (LocoScript) |
| XTP | Data file (Xtree) |
| XWD | X Window Dump format (SDSC Image Tool) |
| XWF | Works file (Yamaha XG) (MIDI sequencing) |
| XWK | Keyboard mapping file (Crosstalk) |
| XWP | Session file (Crosstalk) |
| XWP | Text file (Xerox Writer) |
| XWS | Xara Webstyle Graphic |
| XX | Compressed ASCII archive (XXENCODE) |
| XXE | Compressed ASCII archive (XXENCODE) |
| XY | Text file (XYWrite) |
| XY3 | Document file (XYWrite III) |
| XY4 | Document file (XYWrite IV) |
| XYP | Document file (XYWrite III Plus) |
| XYW | Document file (XYWrite for Windows 4.x) |
| X01 | Secondary index file (Paradox) |
| X02 | Secondary index file (Paradox) |
| X03 | Secondary index file (Paradox) |
| X04 | Secondary index file (Paradox) |
| X05 | Secondary index file (Paradox) |
| X06 | Secondary index file (Paradox) |
| X07 | Secondary index file (Paradox) |
| X08 | Secondary index file (Paradox) |
| X09 | Secondary index file (Paradox) |
| X16 | Macromedia Extra (program extension), 16 bit |
| X32 | Macromedia Extra (program extension), 32 bit |
| Y | Grammar file (Yaac) |
| Y | Compressed Amiga archive (YABBA) |
| YAL | Clipart library (Arts & Letters) |
| YBK | Yearbook file (Microsoft Encarta) |
| YUV | Graphics file (YUV) |
| YZ | Compressed file archive (YAC) |
| Y01 | Secondary index file (Paradox) |
| Y02 | Secondary index file (Paradox) |
| Y03 | Secondary index file (Paradox) |
| Y04 | Secondary index file (Paradox) |
| Y05 | Secondary index file (Paradox) |
| Y06 | Secondary index file (Paradox) |
| Y07 | Secondary index file (Paradox) |
| Y08 | Secondary index file (Paradox) |
| Y09 | Secondary index file (Paradox) |
| Z | Compressed ASCII archive (COMPRESS) |
| Z | Unix file Compressed |
| ZAP | Software installation settings file (Microsoft Windows) |
| ZAP | Compressed file (FileWrangler) |
| ZDG | Compressed text document (Zview) |
| XDP | Label file using Avery DesignerPro Label Design) |
| ZER | Data file (Zerberus) |
| ZGM | Graphics file (ZenoGraphics) |
| ZIP | Zip file Compressed archive |
| ZOM | Compressed Amiga archive (ZOOM) |
| ZOO | An early compressed file format |
| ZVD | Voice file (Zyxel Z-Fax) |
| Z3 | Game module (Infocom) |
| 0 | Data file (GEOWorks) |
| 000-20009 | Used to number old (backup) versions of files (for example, CONFIG.SYS when changed by an installation program); also used to number related data files for multiple users of a small-scale PC application |
| 1ST | Documenting wizard list (Microsoft Visual FoxPro) |
| 001-999 | Database index files used by (Superbase) |
| 8 | Source file (Assembly) (Similar to Microsoft Assembler) |
| 113 | Backup data file (Iomega Backup) |
| 12M | Smartmaster file (Lotus 1-2-3 '97) |
| 123 | Lotus 123 97 file |
| 1PH | TurboTax File |
| 1-STEP | Backup file (Iomega Backup) |
| 2D | Two-dimensional drawing file (VersaCAD) (http://www.versacad.com/vcadhome.htm) |
| 2GR and 3GR | VGA Graphics driver/configuration files (Microsoft Windows) |
| 386 | A file for use in an 80386 or higher microprocessor |
| 3D | Three-dimensional drawing file (VersaCAD) (http://www.versacad.com/vcadhome.htm) |
| 3DM | 3D NURBS modeler, (Rhino) |
| 3DS | A file in 3D Studio (for DOS) format |
| 3DT | 3D Topicscape Database File |
| 411 | Data file (Used by digital cameras) |
| 4GE | Compiled code (Informix 4GL) |
| 4GL | Source code (Informix 4GL) |
| 4V | Music file (Quartet) |
| 669 | Music mod file (Composer 669)(Unis Composer) |
| 669 | Tracker module (Composer 669) |
| 7 | IBM Voice Type Language Script Data file |
| 7Z | 7-Zip Archive File |
| #01 and higher | A method of numbering picture files for a roll of film that has been scanned for computer presentation |
| $$$ | Used by OS/2 to keep track of archived files |
| ~PR | Project backup file (Terramodel) |
| ~$~ | Temporary file (1ST Reader) |
| ~AP | AppExpert project database file (Borland C++ 4.5) |
| ~DE | Project backup file (Borland C++ 4.5) |
| ~MN | Menu backup (Norton Commander) |
| @@@ | Screen files used in the installation and instruction on use of such applications as Microsoft Codeview for C |