Change windows vista default program association via registry
Windows Vista allows users to change and set default program association for most sort of file extension via Control Panel’s “Set Associations” and “Set Default Programs” under “Default Programs” link.

However, there is no option to reset or restore file extension association back to original settings as in freshly installed Windows Vista OS.
List of programs out there under “Set Default Programs” link, such as Internet Explorer, Outlook, Calender, Windows Mail, Windows Media Player, winamp, winzip and Windows Photo Gallery have defined their own default file extensions, types and protocols.
And, user can clearly set the program as the default program to use to open all file sorts and protocols it can open.
Even so, it may not be the default file association such a configured in Windows Vista originally.
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 when that happens 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 . If you unsure, coup browse through all the sub-key under FileExts.
- Delete the sub-key named UserChoice.
- Exit from Registry Editor.
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