I have an MPG file I transferred from my Sony hard disk drive camcorder but Quicktime doesn't let me see the video. A pop up comes up and says, "The movie could not be opened. The file is not a movie file." I don't understand why, and the file is actually Mpeg 2, but it's just named MPG. I also tried opening it up on iMovie but no luck either. Anything I can do or why doesn't it let me open it? Thanks in advance!