Quicktime upload

[farazmit]

Hi
Does Anyone know how I can check whether a file is .mov or not. I don't want to simply look into the file's extension ro see if it's .mov. Instead, I would like to search for some attribute within a .mov file to make sure it's a video. For example, if somebody changes the extension of a .txt file to .mov, I would like to catch that as an error (not a real .mov)

Thanks
Ross