Ok, u know when you are downloading a movie or a game using torrents and is contained in zip files, along with those "R30, R31, R32" unkown files. K, I acidentally opened one of those unknown files in Windows Media Player. Ofcourse, it didn't work, but how would I bring it back to being an unknown file again? I know that this is confusing but please bare with me. Another explanation: If you click those unkown files (R30,R31,etc) a window will open saying that windows cannot open the file. choose an appropiate program or let the web search it for you.( by the way, the icon for those R30 file types are those default "play" icon) So basically, I chose Windows Media Player to open with it and I just knew that u sholdn't do that. U should leave it as it is. Now, when I download another file from p2p containing those "R30, R31" files, along with zip files, instead of the icon (play) it now shows the windows media player icon. Does it affect the file if I did that? Cuz I burned the movie and the first 5 sec of the movie doesn't have any sounds, but the rest has.