I need some help loading a movie in quicktime. When I try to open the file, I get the following error: "The movie could not be opened. The file is not a movie file." Following others' advice on a similar thread in this forum, I downloaded the Perian plug-in for Quicktime, and bought the upgrade to Quicktime Pro and the additional QuicktimeMPEG2 upgrade (though I think my file is just an mpeg). But I'm still getting the same error message. I have been able to play the video with VLC, so I don't think the file is the problem. The reason I'm not just using VLC is that I need to be able to go forward and backward frame-by-frame because I'm using still images for a publication. Also, if there's an alternative program to Quicktime and VLC that allows moving forward and backwards frame by frame and taking snapshots, that would also solve the problem. Any advice would be appreciated.