Windows Vista and Windows 7 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.
1. Run Registry Editor and navigate to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\[Extension]
2. Expand the [extension] key and choose UserChoice key and delete all its sub keys
3. 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.
- Windows Server 2008 R2
- Windows 7
- Windows Server 2008
- Windows Vista