File Formats or Extentions
This is a list of file name extensions or suffixes that indicate the format or usage of a file and a brief description of that format.
If you know of a file name extension and format that should be added to this list, please e-mail and I'll add it.

Every file format in the world
http://www.whatis.com/ff.htm
This is a list of file name extensions or suffixes that indicate the format or usage of a file and a brief description of that format.

A  B  C  D  E  F  G  H  I  J  K  L  M 
N O P Q R S T U V W X Y Z
A...

ABK Corel Draw AutoBackup
ACL Corel Draw 6 keyboard accelerator
ACM Used by Windows in the system directory
ACP Microsoft Office Assistant Preview file
ACT Microsoft Office Assistant Actor file
ACV OS/2 drivers that compress and decompress audio data
AD  After Dark screensaver
ADB Appointment database used by HP 100LX organizer
ADD OS/2 adapter drivers used in the boot process
ADM After Dark MultiModule screensaver
ADP Used by FaxWorks to do setup for fax modem interaction
ADR After Dark Randomizer screensaver
AFM Adobe font metrics
AI  Adobe Illustrator drawing
AIF Apple Mac AIFF sound
ALB JASC Image Commander album
ALL Arts & Letters Library
ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
ANI Animated Cursor
ANS ANSI text
API Application Program Interface file; used by Adobe Acrobat
ARC LH ARC (old version) compressed archive
ARJ Robert Jung ARJ compressed archive
ART Xara Studio drawing
ART Canon Crayola art file
ASC ASCII text
ASD WinWord AutoSave
ASM Assembler language source file
ASP Active Server Page (an HTML file containing a Microsoft server-processed script)
ASP Procomm Plus setup and connection script
AST Claris Works "assistant" file
ATT AT&T Group 4 bitmap
AVI Microsoft Video for Windows movie
AWD FaxView document

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B...

BAK        Backup file
BAS        BASIC code
BAT        Batch file
BFC        Windows 95 Briefcase document
BG         Backgammon for Windows game
BI         Binary file
BIF        GroupWise initialization file
BIN        Binary file
BK and BK$ Sometimes used to denote backup versions
BKS        An IBM BookManager Read bookshelf
BMK        An A bookmark file
BMP        Windows or OS/2 bitmap
BM1        Apogee BioMenace data file
BRX        A file for browsing an index of multimedia options
BS1        Apogee Blake Stone data file
BTM        Batch file used by Norton Utilities
B4         Helix Nuts and Bolts file

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C...

CAB   Microsoft cabinet file (program files compressed for software distribution)
CAL   CALS Compressed Bitmap
CAL   Calendar schedule data
CAT   IntelliCharge categorization file used by Quicken
CB    Microsoft clean boot file
CCB   Visual Basic Animated Button configuration
CCF   Multimedia Viewer configuration file used in OS/2
CCH   Corel Chart
CCM   Lotus CC:Mail "box" (for example, INBOX.CCM)
CDA   CD Audio Track
CDF   Microsoft Channel Definition Format file
CDR   Core Draw drawing
CDT   Corel Draw template
CDX   Corel Draw compressed drawing
CEL   CIMFast Event Language file
CFB   Comptons Multimedia file
CFG   Configuration file
CGI   Common Gateway Interface script file
CGM   Computer Graphics Metafile
CH    OS/2 configuration file
CHK   File fragments saved by Windows Disk Defragmenter or ScanDisk
CHP   Ventura Publisher chapter
CIL   Clip Gallery download package
CIM   Sim City 200 file
CIN   OS/2 change control file that tracks changes to an INI file
CK1   iD/Apogee Commander Keen 1 data file
CK2   iD/Apogee Commander Keen 2 data file
CK3   iD/Apogee Commander Keen 3 data file
CK4   iD/Apogee Commander Keen 4 data file
CK5   iD/Apogee Commander Keen 5 data file
CK6   iD/Apogee Commander Keen 6 data file
CLASS Java class
CLP   Windows Clipboard file
CLS   Visual Basic Class Module
CMD   Command file for Windows NT (similar to a DOS .BAT file)
CMD   DOS CP/M command file
CMD   dBase-II program file
CMF   Corel Metafile
CMP   JPEG Bitmap
CMP   Address document
CMV   Corel Move animation
CMX   Corel Presentation Exchange image
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
COD   Microsoft C compiler output as displayable machine language/assembler with original C as comments
COM   Command file (program)
CPD   Fax Cover document
CPE   Fax Cover document
CPI   Microsoft MS-DOS code page information file
CPL   Control Panel extension
CPL   Corel colour palette
CPP   C++ code
CPR   Corel Presents Presentation
CPT   Corel Photo-Paint image
CPX   Corel Presentation Exchange Compressed drawing
CRD   Cardfile file
CRP   Corel Presents Run-Time Presentation
CRT   Certificate file
CSC   Corel Script
CSP   PC Emcee On-Screen image
CSV   Comma-separated values file
CT    Scitex CT Bitmap Used in general to mean a file containing control information.
CTL   FAXWorks uses it to keep information about each fax sent and received.
CUE   Microsoft Cue Cards data
CUR   Windows Cursor
CUT   Dr Halo bitmap
CV    Corel Versions archive
CV    Microsoft CodeView information screen
CWK   Claris Works data file
CWS   Claris Works template

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D...

DAT Data file
DAT WordPerfect Merge Data
DBF Aston-Tate dBASE database
DBX DataBeam image
DCS Desktop Color Separation file
DCX Fax image (based on PCX)
DDF BTRIEVE database
DEF SmartWare II data file
DEF C++ Definition
DER Certificate file
DIB Device-Independent Bitmap
DIC Dictionary
DIF Data Interchange Format spreadsheet
DLG C++ Dialogue Script
DLL Dynamic-Link Library
DOC FrameMaker or FrameBuilder document
DOC WordStar document
DOC WordPerfect document
DOC Microsoft Word document
DOT Microsoft Word document Template
DRV Driver
DRW Micrografx Designer/Draw
DSQ Corel QUERY file
DWG AutoCAD drawing
DXF AutoDesk Drawing Interchange Format

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E...

EMF Enhanced Windows Metafile
ENC Encore file
EPS Encapsulated PostScript image
ER1 ERWin file
ERX ERWin file
EVY Envoy document
EWL Microsoft Encarta document
EXE Executable file (program)

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F...

F   FORTRAN file
F77 FORTRAN file
F90 FORTRAN file
FAV Microsoft Outlook navigation bar
FAX FAX Type image
FH3 Aldus Freehand 3 drawing
FIF Fractal image file
FLC AutoDesk FLIC animation
FLI AutoDesk FLIC animation
FLT Corel filter
FMT Microsoft Schedule+ print file
FOG Fontographer font
FON System font
FOR FORTRAN file
FOT Font-related file
FP  FileMaker Pro file
FP1 Flying Pigs for Windows data file
FP3 FileMaker Pro file
FPX FlashPix bitmap
FRM Form
FRM FrameMaker or FrameBuilder document
FRM WordPerfect Merge Form
FRM Visual Basic form
FRX Visual Basic form stash file

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G...

GAL Corel Multimedia Manager album
GED Graphic Environment Document (drawing)
GEM GEM metafile
GEN Ventura-Generated text file
GFI Genigraphics Graphics Link presentation
GFX Genigraphics Graphics Link presentation
GID Windows 95 global index file (containing help status)
GIF CompuServe bitmap
GIM Genigraphics Graphics Link presentation
GIX Genigraphics Graphics Link presentation
GNA Genigraphics Graphics Link presentation
GNX Genigraphics Graphics Link presentation
GRA Microsoft Graph
GRP Program Manager Group
GWX Genigraphics Graphics Link presentation
GWZ Genigraphics Graphics Link presentation
GZ  Unix Gzip compressed file

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H...

H    C program header
HED  HighEdit document
HEL  Microsoft Hellbender saved game
HEX  Macintosh BinHex 2.0 file
HGL  HP Graphics Language drawing
HLP  Help file
HOG  Lucas Arts Dark Forces WAD file
HPJ  Visual Basic Help Project
HPP  C++ program header
HQX  Macintosh BinHex 4.0 file
HST  History file
HT   HyperTerminal
HTM  Hypertext document
HTML Hypertext document

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I...

ICA Citrix file
ICB Targa bitmap
ICM Image Color Matching profile file
ICO Windows Icon
IDD MIDI Instrument Definition
IFF Aminga ILBM
IGF Inset Systems metafile
IIF QuickBooks for Windows interchange file
IMA WinImage file
IMG GEM image
INF Information file
INI Initialization file
INS X-Internet sign-up file
ISP X-Internet sign-up file
IW  Idlewild screensaver

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J...

JAR  Java applet archive file
JFF  JPEG bitmap
JIF  JPEG bitmap
JN1  Epic MegaGames Jill of the Jungle data file
JPEG JPEG bitmap
JPG  JPEG bitmap
JTF  JPEG bitmap

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K...

KDC Kodak Photo-Enhancer
KFX KoFax Group 4 image
KYE Kye game data

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L...

LBM Deluxe Paint bitmap
LDB Microsoft Access lock file
LEG Legacy document
LHA Alternate file suffix for LZH
LIB Library
LOG Log file
LPD Helix Nuts and Bolts file
LRC Intel Video Phone file
LST List file
LZH LH ARC compressed archive
LZS Skyroads data file

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M...

M3D  Corel Motion 3D animation
MAC  MacPaint image
MAD  Microsoft Access module
MAF  Microsoft Access Form
MAK  Visual Basic or MS Visual C++ Project
MAM  Microsoft Access Macro
MAP  Map file
MAP  Duke Nukem 3D WAD game file
MAQ  Microsoft Access Query
MAR  Microsoft Access Report
MAT  Microsoft Access Table
MAZ  Hover maze data
MB1  Apogee Monster Bash data file
MCC  Dialer10 calling card
MCS  MathCAD image
MCW  Microsoft Word for Macintosh document
MDA  Microsoft Access add-in
MDB  Microsoft Access database
MDE  Microsoft Access MDE file
MDN  Microsoft Access blank database template
MDW  Microsoft Access Workgroup
MDZ  Microsoft Access wizard template
MER  Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
MET  Presentation Manager metafile
MI   Miscellaneous
MIC  Microsoft Image Composer file
MID  MIDI music
MMF  Microsoft Mail File
MMM  Microsoft Multimedia Movie
MOD  Microsoft Multiplan spreadsheet
MOV  QuickTime for Windows movie
MPE  MPEG animation
MPEG MPEG animation
MPG  MPEG animation
MPP  Microsoft Project file
MPP  CAD drawing file format
MP3  MPEG Audio Layer 3 (AC3) file
MSG  Microsoft Mail message
MSN  Microsoft Network document
MSP  Microsoft Paint bitmap
MUS  Music
MVB  Microsoft Multimedia Viewer file

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N...

NAP NAP Metafile Vector image

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O...

OBD Microsoft Office binder template
OBD Microsoft Office Binder
OBJ Object file
OBZ Microsoft Office Binder Wizard
OCX Microsoft Object Linking and Embedding custom control
OFN Microsoft Office FileNew file
OFT Microsoft Outlook template
OLB OLE Object Library
OLE OLE object
ORG Organiser file

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P...

P10 Tektronix Plot 10 drawing
PAB Microsoft Personal Address Book
PAK Quake WAD file
PAL Windows colour palette
PAT Corel Draw pattern
PBK Microsoft Phonebook
PBM Portable Bitmap
PCD Kodak Photo-CD image
PCL HP Laserjet bitmap
PCS PICS animation
PCT Macintosh PICT drawing
PCX ZSoft PC Paintbrush bitmap
PDF Adobe Acrobat Portable Document Format or Netware Printer Definition File
PFA Type 1 font (ASCII)
PFB Type 1 font (binary)
PFC PF Component
PFM Printer Font Metrics
PGL HP Plotter drawing
PGM Portable Graymap (bitmap)
PIC PC Paint bitmap
PIC Lotus picture
PIC Macintosh PICT drawing
PIF Program Information File
PIF IBM PIF drawing
PIG Lucas Arts Dark Forces WAD file
PIN Epic Pinball data file
PIN Epic Pinball data file
PIX Inset Systems bitmap
PLT HPGL Plotter drawing
PLT AutoCAD Plot drawing
PM5 Pagemaker 5.0 file
PM6 Pagemaker 6.0 file
P65 Pagemaker 6.5 file
PNG Portable Network Graphics bitmap
PNG Paint Shop Pro Browser catalogue
PNT MacPaint graphic file
POT Microsoft PowerPoint Template
PP4 Picture Publisher 4 bitmap
PPA Microsoft PowerPoint Add-in
PPM Portable Pixelmap bitmap
PPS Microsoft PowerPoint slide show
PPT Microsoft PowerPoint presentation
PRE Lotus Freelance presentation
PRF Windows system file
PRN Print Table (space delimited text)
PRS Harvard Graphics for Windows presentation
PS  Postscript Interpreted drawing
PSD Adobe Photoshop bitmap
PST Microsoft Outlook Personal Folder File
PUB Ventura Publisher publication
PUB Microsoft Publisher document
PWD Microsoft Pocket Word document
PWZ Microsoft PowerPoint Wizard
PXL Microsoft Pocket Excel spreadsheet

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Q...

QAD PF QuickArt Document
QBW QuickBooks for Windows file
QLB Quick Library
QRY Microsoft Query
QT  QuickTime Movie
QTM QuickTime Movie

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R...

RA  Real Audio sound
RAM Real Audio sound
RAS Sun Raster Images bitmap
RAW Raw File Format (bitmap)
RC  Microsoft Visual C++ Resource Script
REC Recorder macro
REG Registration file
RES Microsoft Visual C++ Resource
RFT RFT-DCA
RLE Run-Length Encoded bitmap
RM  Real Audio video file
RMI MIDI music
ROV Rescue Rover data file
RPT Microsoft Visual Basic Crystal Reports file
RTF Rich Text Format document

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S...

SAM Ami Professional document
SAV Saved game file
SC2 Microsoft Schedule+ 7
SCD Matrix/Imapro SCODL slide image
SCD Microsoft Schedule+ 7
SCH Microsoft Schedule+ 1
SCP Dial-Up Networking Script
SCR Windows screensaver
SCR Fax image
SCT Scitex CT bitmap
SDL SmartDraw library
SDR SmartDraw drawing
SDT SmartDraw template
SEA Self-expanding archive (used by Stuffit for Mac files and possibly by others)
SEP Tagged Image File Format (TIFF) bitmap
SHB Corel Show presentation
SHB Document shortcut file
SHG Hotspot bitmap
SHS Shell scrap file
SHW Corel Show presentation
SIT Stuffit archive of Mac files
SLK Symbolic Link (SYLK) spreadsheet
SND NeXT sound
SND Mac Sound Resource
STY Ventura Publisher style sheet
SVX Amiga 8SVX sound
SYS System file

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T...

TAR   Tape Archive
TAZ   Unix Gzip/Tape Archive
TEX   Texture file
TGA   Targa bitmap
TGZ   Unix Gzip/Tape Archive
THEME Windows 95 Desktop Theme
THN   Graphics Workshop for Windows thumbnail
TIF   Tagged Image File Format (TIFF) bitmap
TIFF  Tagged Image File Format (TIFF) bitmap
TIG   Tiger file, used by US government to distribute maps
TLB   OLE Type Library
TMP   Windows temporary file
TRM   Terminal file
TTF   TrueType font
TWF   TabWorks file
TWW   Tagwrite Template
TX8   MS-DOS Text
TXT   Text

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U...

UDF Windows NT Uniqueness Database File
URL Internet shortcut

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V...

VBP Visual Basic Project
VBX Visual Basic custom control
VCF Vevi Configuration File; defines objects for use with Sense8's WorldToolKit
VDA Targa bitmap
VI  Virtual Instrument file from National Instruments LABView product
VLB Corel Ventura Library
VOC Creative Labs Sound Blaster sound
VP  Ventura Publisher publication
VST Targa bitmap
VSW Visio Workspace file

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W...

WAD Large file for Doom game containing video, player level, and other information
WAV Windows Waveform sound
WB1 QuattroPro for Windows spreadsheet
WB2 QuattroPro for Windows spreadsheet
WBK Microsoft Word Backup
WBL Argo WebLoad II upload file
WCM WordPerfect Macro
WDB Microsoft Works database
WEB CorelXara Web document
WGP Wild Board Games data file
WID Ventura width table
WIL WinImage file
WIZ Microsoft Word Wizard
WK1 Lotus 123 versions 1 & 2 spreadsheet
WK3 Lotus 123 version 3 spreadsheet
WK4 Lotus 123 version 4 spreadsheet
WKS Lotus 123 Worksheet spreadsheet
WKS Microsoft Works document
WLF Argo WebLoad I upload file
WLL Microsoft Word Add-In
WMF Windows Metafile
WP  WordPerfect document
WPW Novel PerfectWorks document
WP4 WordPerfect 4 document
WP5 WordPerfect 5 document
WP6 WordPerfect 6 document
WPD WordPerfect Demo
WPD WordPerfect Document
WPG WordPerfect Graphic
WPS Microsoft Works document
WPT WordPerfect Template
WQ1 QuattroPro/DOS spreadsheet
WQ2 QuattroPro/DOS version 5 spreadsheet
WRI Write document
WRL Virtual Reality model
WS1 WordStar for Windows 1 document
WS2 WordStar for Windows 2 document
WS3 WordStar for Windows 3 document
WS4 WordStar for Windows 4 document
WS5 WordStar for Windows 5 document
WS6 WordStar for Windows 6 document
WS7 WordStar for Windows 7 document
WSD WordStar 2000 document
WVL Wavelet Compressed Bitmap

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X...

XAR Corel Xara drawing
XLA Microsoft Excel add-in
XLB Microsoft Excel toolbar
XLC Microsoft Excel chart
XLD Microsoft Excel dialogue
XLK Microsoft Excel backup
XLM Microsoft Excel macro
XLS Microsoft Excel worksheet
XLT Microsoft Excel template
XLV Microsoft Excel VBA module
XLW Microsoft Excel workbook / workspace
XR1 Epic MegaGames Xargon data file
XTP XTree data file
XY3 XYWrite III document
XY4 XYWrite IV document
XYP XYWrite III Plus document
XYW XYWrite for Windows 4.0 document

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Y...

YAL Arts & Letters clipart library
YBK Microsoft Encarta Yearbook

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Z...

Z   Unix Gzip Compressed
ZIP Zip file  Compressed archive

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