Quote:
Unfortunately the windows Picture and Fax Viewer appears to be integrated into windows explorer and is not a stand-alone program - at least, I can't find it anywhere

Looking at the shell extension details in the system registry for the picture file extensions in question should reveal the correct command line to launch the picture and fax viewer. Even if it's not a stand alone app, you should be able to find the correct command line to launch it (for example, if it's launched with rundll32).

My question is... Why? There's other third party picture viewers and editors that are much better.