Encryption of a movie file.
I have downloaded an avi movie and I have been asked to look for the video codec in u website
Try using VLC Media PLayer
It is capable of playing (almost?) any video file, and should definitely be able to play your video.
If you didn't want to try a different player, and you are on:
I have heard of some "films" simply being videos directing you to go a random website on the internet and download a codec from there and install it, whereby they can potentially install a virus and other malicious software onto your computer. While this may not be the case for you it is a possibility.
I'd go with Azz and try playing it with VLC, if that can't figure out what the file is and play at least some of it then more likely than not the file is bogus.