Ok Omanes,
Ensuring you're logged in as an administrator, let's go into the registry and try to fix it. Go to start, run and enter
browse to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExtsCode:regedit
Find the key called ".pub" and subkey "openwithprogids" and click on it and provide a screenshot of the right pane. Then do the same for "openwithlist" if it exists.
-Edit: openwithlist is probably the most relevant in your case come to think of it.
Bookmarks