myarmor

I know, and I do. When it says extensions defined with only a progid string are unused, and that mechanism is one of the "legal" ones for associating files to a program, then in my opinion this is a bug.

When I select "Unused file extensions" and analyze, the program lists completely valid and used extensions as unused. The ones I refer to is located at HKCU\Software\Microsoft\Windows\Currentversion\Explorer\FileExts\ In this particular case they are in the usual format, but instead of using subkeys it has a stringvalue named "ProgId" with the value "Xnview.Image". These are completely valid, and are used, a doubleclick starts the program etc.