First off if you already have windows on the machine then maybe it's time to upgrade your setup. Unless your machine is <300mhz or you have an arcade monitor there isn't any reason to stay in dos. Secondly there's a reason dos media players are scarce. Dos simply wasn't designed to handle the decoding of mp3 format. It barely handles wav files. This is due to the way dos handles memory allocation and process managment I believe. (Not a dos expert.) There are a very few command-line based mp3 players, but try one and you'll realize just why you need windows. (Scratchy, distorted sound.)