hurm, fyi, the preview thingy will never work...(it dont work for me too)..one tip for u to preview the file, copy the downloaded file (whether it's completed or not, just copy) n then, go to Folder Options and go to "View" tab.. untick the "Hide extensions for known file types" menu. Erase ".bc" extension for BitComet n u will see it with the extension that it should have. Eg: "Hahaha.avi.bc!" to "Hahaha.avi" Got it? Then play using normal player.