I have downladed a game virtua tennis and the file is in mdf format. I have extracted the files from that file in another folder using power iso and installed the game. The game demands dvd to be inserted in order to play the game. As i have downloaded the game from internet i dont have any dvd. Secondly, if however, i write that file on dvd, my laptop doesnt have dvd rom. Tell me what should i do to play the game.