An Utility to Unassociate File Types in Windows 7 and Vista

The utility discussed in this article helps you unassociate a file type quickly in your Windows Vista or Windows 7 PC. Windows 7 & Vista do not provide a GUI option to unassociate file types. That's the reason I wrote this simple tool.
Unassociate file types in Windows 7 & Windows Vista

* Download unassoc.zip from the Attachments section, and save to Desktop
* Extract the contents to a folder and run the file unassoc.exe
* Select the file type from the list
* Click Remove file association (User)

The user-specific association for the chosen file type is now removed from the registry. The system will now use the global file association settings.
http://www.winhelponline.com/articles/2 ... Vista.html