ASSOC

Display or change the association between a file extension and a fileType

Using this command will create or change values in the registry at HKCR\\ .<file extension>

ASSOC /?

ASSOC .ext = [filetype]

Display all the current file associations:

ASSOC

Display the current File Type for that extension:

ASSOC .ext

Delete the association for that file extension:

ASSOC .ext=

.ext (NT4)

The file extension. A file extension is the last few characters in a FileName after the period. So a file called JANUARY.HTML has the file extension .HTML.

The File extension is used by Windows NT to determine the type of information stored in the file and therefore which application(s) will be able to display the information in the file. File extensions are not case sensitive and are not limited to 3 characters.

More than one file extension may be associated with the same File Type.

e.g. both the extension .JPG and the extension .JPEG may be associated with the File Type "jpegfile"

At any one time a given file extension may only be associated with one File Type.

e.g. If you change the extension .JPG so it is associated with the File Type "txtfile" then it's normal association with "jpegfile" will disappear. Removing the association to "txtfile" does not restore the association to "jpegfile"

filetype (NT4)

Specifies the file type to associate with the file extension.

File Types can be displayed in the Windows Explorer GUI: [View, Options, File Types] however the spelling is usually different to that expected by the ASSOC command e.g. the File Type "txtfile" is displayed in the GUI as "Text Document"and "jpegfile" is displayed as "image/jpeg"

/? (NT4)

Display help.

FTYPE - Edit file types (used in file extension associations)
ASSOCIATE - One step file association
Equivalent Linux BASH commands:
export - Set an environment variable

none.

Viewing file associations:

    ASSOC .txt
    ASSOC .doc
    ASSOC backup.txt

Editing file associations:

    ASSOC .txt=txtfile
    ASSOC .DIC=txtfile
    ASSOC .html=Htmlfile

Deleting a file association:

    ASSOC .html=

none.

External

DOS

none

Windows

none

Windows NT

NT4 NT2000 NTXP NT2003