[ it's my Windows ]

Windows Vista allows you to change the program used to open a file. Sometime We set wrong association with file type and there is no option to revert back to default settings. So here is the only way to do that.

How to-

1) Run Registry Editor
2) Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\[Extension]
3) Expand the [extension] key and choose UserChoice key and delete all its sub keys
4) If it doesn’t work, delete the UserChoice key itself.

NOTE: To revert back to all default file association as we get after fresh clean installation of Windows Vista, We can delete all sub keys under FileExts.

How do I ?, Windows Server, Windows Vista