What are the extensions of the files you can't see? Are they standard graphics file types: .jpg, .gif, .png, etc?

I had a friend call me in a panic because all of his photos had disappeared. Turns out he'd changed the file names from something like "IMG_001.jpg" to "IMG_001.jpg edited by me on 11/11". It was a nice idea, but it completely messed up Windoze's file association system. When I had him rename the file in question to "IMG_001 edited by me on 11/11.jpg" everything worked out fine.

Just something to consider.

RtR
PSP X2 Ult