On my Mac I am trying to open Bitmap (.bmp) files in Photo (2.04). Each time I try, I get a notice saying that a color profile was selected for me. I see nothing but a transparent 600x600px square, which is the size of my document (a seamless graphic/bumpmap tile created in FilterForge that works fine in other software).
I can load it by going into the directory, previewing it, then selecting Edit > Copy, going back into Photo 2 and Pasting it in. If I chose the right file, it will have the same name it was supposed to and all, though I will have to turn snap on and line up the pasted content. That is quite a work around.