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Restore and Reset File Association in Windows Vista Back to Original Default

Windows Vista allows user to change and set default program association for most kind of file extension type via Control Panel’s “Set Associations” or “Set Default Programs” under “Default Programs” link.

Unless user remembers and knows the original file association and change the default program for the kind of file type accordingly using the graphical user interface (GUI) in Control Panel, else here’s another workaround to restore and reset the file association to the default Windows Vista version of file association.

Click Start Menu, and then type regedit in the Start Search and press ENTER.
Navigate to the following registry branch:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\FileExts\[ext]

Replace the [exe] with the actual file extension that you want to restore its file type association to revert back to original Windows Vista default. If you unsure, simply browse through all the sub-key under FileExts.
Delete the sub-key named UserChoice.
Exit from Registry Editor.

Source : My Digital Life