Problem with Torrent file and it's Extraction with winrar

Can anbody help me i have downloaded CBT nuggets exchange server2007 from torrent site
size 157mb till extraction all goes fine but when i try to play it by VLC mediaplayer,winamp ,window media player it doen't get started
it's file format look like nsid-ex236
VLC media file(.bin)
204875kb
what i have to do whther i have to use software to convert it in other
format or use any other trick