I downloaded S.T.A.L.K.E.R. from here http://www.fulldls.com/torrent-games-27484.htmlbut when I try to unrar, I get this error:S.T.A.L.K.E.R. (STALKER) Shadow of Chernobyl-RELOADED\rld-stalker.part098.rar: CRC failed in rld-stalker.iso.avi. The file is corrupt.Is there any way to fix this? Also, this might be a stupid question, but why are the extensions .avi?