Well, I found it. I made some other changes we can discuss if you want, but it appears the permissions on the following registry key had been completely removed. Check yours to see if it shows the same thing. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt\UserChoice Right click the UserChoice key and select permissions. It should show a dialog with a warning about all the permissions being removed. The permissions for that key should be the same as the one for the .log entry above. I added the administrator and the other entries showed up, then I just had to make sure they looked the same as the .log permissions. To enter yourself, on the Security tab, click Add, then type your user name and select Check Names. When you add it, the others may show up. Since it is late, we can discuss this tomorrow if necessary.