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ASSOC
Display or change the association between a file extension and a fileType
Syntax ASSOC .ext = [fileType] ASSOC ASSOC .ext ASSOC .ext = Key .ext : The file extension fileType : The type of file
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"
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"
The command ASSOC followed by just a file extension will display the current
File Type for that extension.
ASSOC without any parameters will display all the current file associations.
ASSOC with ".ext=" will delete the association for that file extension.
Did you leave the Always Use This Program To Open This File
option turned on?
To change it back so it prompts you to specify a program each time, just delete
the association with that file type
ASSOC .ext=
[where .ext is the file extension].
Now when you double-click on a file of that type, the system will ask you what
program you want to use.
Using the ASSOC command will edit values stored in the registry at HKey_Classes_Root\.<file
extension>
Therefore it's possible to use registry permissions to protect a file extension
and prevent any file association changes.
Examples:
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=
Repair .REG and .EXE file associations:
ASSOC .EXE=exefile
ASSOC .REG=regfile
Digging through CLASSES_ROOT entries often reveals more than
one shell for the same application, for example the Apple Quick Time player
has two entries, one to "open" (which gives an annoying nag screen)
and one to just "play" the QT file:
[HKEY_CLASSES_ROOT\MOVFile\shell\open] and [play]
In cases like this you can change the default action e.g.
[HKEY_CLASSES_ROOT\MOVFile\shell]
@="play"
"Of all forms of caution, caution in love is perhaps the most fatal
to true happiness" - Bertrand
Russell
Related Commands:
FTYPE - Edit file types (used in file extension
associations)
Batch file to list the application associated with
a file extension
ASSOCIAT - One step file association (Resource
Kit)
Q162059 - Associate
Internet Explorer with MS Office files.
Equivalent Linux BASH commands:
none