How to Unassociate a File Extension Type in Vista and Windows 7
This will show you how to set a file extension to be associated with nothing for all users instead of some default program without having to delete the file extension unless you wanted to.
Download the free unassoc.zip
file and save it to your desktop.
Right click on unassoc.zip
(On Desktop) and click Open
Extract both files to the desktop. (See screenshot below)
Click on the Unassoc.exe
icon to run the program.
NOTE: I would recommend that you put these two files in a new folder and save them in your C:\Program Files folder, then make a shortcut for the Unassoc.exe to use.
Click on Continue
in the UAC prompt.
6. To Unassociate a File Extension Type
A) Click on a file extension type from the list in the left pane to select it. (See screenshot below step 7)7. To Delete a File Extension Type
B) Click on Remove file association (User).
A) Click on a file extension type from the list in the left pane to select it. (See screenshot)8.
B) Click on Delete file type.
Close program when done.