Codec Information Appliance

Movie files can be a real hassle to play if you dont have the right "codec" - a codec is a software component that tells your video player how to handle a certain file type. There are dozens of popular video formats and if you dont have the right codec installed for a particular file type, you'll have problems watching the video.
The Codec Information Appliance is a tool that will analyse a selected video file and tell you what codec is required to play it, and whether you have it installed - check out http://www.headbands.com/gspot/ for the free download

Check it out...