Remove Unassociate File Types in windows. Each file type has an extension to identify file type to open the file .You can set or change these file type associations with any file easily with unassoc software.
Download unassoc software and installed it on your machine.
Run this setup by double click on it , you will see this
Now select the file type which you want to remove I’m removing .acc format which is used for audio file
Click on delete file type
Note – Make sure before deleting this extension as it will permanently deleted from your system and it can’t be undo.
After clicking on Yes , refresh the list button and see this extension won’t be there.