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everytime i upload a torrent from rapidshare or whereever, it downloads fine, but then my computer says it does not know what program to open the file with, so I can't do anything with it, can anyone help, I've only got to part the part where Alita falls apart through other sites, and I really want the rest, so if you could give any suggestions.

What is the extension the files have?
Take a look here: http://filext.com/

Let me know if you've solved your problem.