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assoc

Displays or modifies file name extension associations. If used without parameters, assoc displays a list of all the current file name extension associations.

Note

This command is only supported within cmd.exe and is not available from PowerShell. Though you can use cmd /c assoc as a workaround.

Syntax

assoc [<.[ext]>[=[<filetype>]]]

Parameters

Parameter Description
<.ext> Specifies the file name extension.
<filetype> Specifies the file type to associate with the specified file name extension.
/? Displays help at the command prompt.

Remarks

  • To make changes in associations, you need administrator privileges.

  • To remove the file type association for a file name extension, add a white space after the equal sign by pressing the SPACEBAR.

  • To associate files without extension to a file type, use just a dot (see the examples).

  • To view current file types that have open command strings defined, use the ftype command.

  • To redirect the output of assoc to a text file, use the > redirection operator.

Examples

To view the current file type association for the file name extension .txt, type:

assoc .txt

To remove the file type association for the file name extension .bak, type:

assoc .bak=

Note

Make sure you add a space after the equal sign.

To view the output of assoc one screen at a time, type:

assoc | more

To send the output of assoc to the file assoc.txt, type:

assoc>assoc.txt

Associate .log to text files:

assoc .log=txtfile

Associate files with no extension to text files:

assoc .=txtfile