>>>This file is downloaded using torrent software. The strange thing (and maybe it is because I don't understand how torrent program works) is that I can "open" the file within the torrent software and see all the files. But when I try to copy them somewhere I get this message that the file is too big. So it looks like the file is not corrupted.
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>>The signature of the file and some of its header content might be ok but a great part of it seems to be in fact corrupted. That might explain why you get some out of it but not the file itself.
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>>For that size, there is definitely something wrong. As, it would take one hell of an algorythm to compress like that. :)
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>As I mentioned in another messages on this thread that I can "open" this zip file in the Torrent program (u-torrent). Therefore the file could be ok. But it could be that the .zip extension is misleading as it is only "zipped" for Torrent program. I will read the article you suggested in another message; maybe it will shed more light.

Are you sure the download has completed? A torrent contains a list of files, so the downloader knows their names etc before they actually arrive.