If I understand correctly, I think you'll need to run the "folder" association fix listed on the link below (last item in the table). That should re-associate it for you
http://www.winhelponline.com/blog/fi...for-windows-7/
Quote:
To fix the association for a particular file type:
1. Download the corresponding fix from the above table. (Use Right-click – Save as option in your browser to download the fixes.)
2. Unzip the file and extract the .REG file to Desktop.
3. Right-click the REG file and choose Merge. Alternately, you can open the Registry Editor and then using the Import option from the File menu, to merge the REG file contents.
Note that you need to be an administrator to apply these fixes.
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