If you have Photoshop, just try to open the .php file and see. I'm not familiar with .php pics though, and I think photoshop extensions are .psd and .pdd -- still Photoshop opens a lot of file types so try it.
Hey, come to think of it, are you sure that file actually is a pic? I doubt it now because I just notices that .php comes up in the URL for the BB pages here ...