Microsoft DOS assoc command

Updated: 11/10/2017 by Computer Hope

About assoc

The assoc command displays the file association for each of the different file extensions on the computer.


The assoc command is an internal command that is available in the below Microsoft operating systems.

Windows 2000
Windows XP
Windows Vista
Windows 7
Windows 8
Windows 10


Displays or modifies file extension associations

ASSOC [.ext[=[fileType]]]

.ext Specifies the file extension to associate the file type with
fileType Specifies the file type to associate with the file extension

Type ASSOC without parameters to display the current file associations.
If ASSOC is invoked with just a file extension, it displays the current file association for that file extension. Specify nothing for the file type and the command will delete the association for the file extension.

Assoc examples


Displays a file association of each of the file extensions on the computer.

assoc .txt

Displays the file extension for a .txt file as shown below.