It’s possible that it’s just looking in the wrong place. At the least, it should be somewhere in your /runtime/textures, so I’d suggest going to that folder and doing a search there. It’s also possible the filename is spelled wrong, although that’s a lot less common. If the folder is there, and there’s a similar but not identically named file, that’s probably the one you’re looking for. Either way, the cr2 or pp2 can be opened with any text editor, once you find the file, and you can replace the the wrong file path with the correct file path. (I’ve done that a few times after I got really annoyed repeatedly having to find the same files again and again.)
(Mike types faster than I do. *nods*)
As to hiding parts, check the material zones and see if you can make parts of it transparent with the opacity slider.