Windows photo Viewer opens all my programs

Problem

Windows 7

Every single programs opens up with windows photo viewer

Solved the problem

1.Click Start Menu, and then type regedit in the Start Search and press ENTER. Right click on regedit from the search results and run as administrator.

2.Navigate to the following registry branch:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\FileExts\[ext]
Replace the [ext] with the actual file extension that you want to restore its file type association to revert back to original Windows 7 default (probably .lnk). If you unsure, simply browse through all the sub-key under FileExts.

3. Delete the sub-key named UserChoice.

4. Exit from Registry Editor.