1. What Gallery shows you is what Media Scanner finds when you start the phone. 36QUIDWA.jpg will show as a jpg file, and appear in an "album" in Gallery (the album name is the folder name the file is in), but it could be a null file (nothing in it, just the name in the directory). If there's no file, it's not in any format. (It's like asking what language the information on a blank piece of paper is written in.)