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