Best I found out is that you can unpack it using a program called Dragon Unpacker, and you get 2 files. A .bmp with the song name or something on it, and a .669 file. You can open the .669 file with Modplug Tracker or something like that, anything that plays MOD files I guess. You can view a pattern using Modplug Tracker, but I have no idea what it means.
