Ok so I wanted to hide a movie file so I changed its extension to .jpg to throw off people who were looking for it. Now I want to watch the file, but I don't remember the original file format. The movie was recorded on a flip camera, but i tried changing the extension to .mp4 (the file format used by most flip cameras supposedly) and it didn't work. I can play the movie without audio, but the audio is the interesting part of the movie. Is there any way to remedy my problem?! Thanks in advance.