I always thought it would be nice if mod files support MP3 compression (and maybe Vorbis in the future), but I never heard of an MP3 files carrying a mod file? That's weird... I guess it wont play in just any MP3 player then... I really like mod files myself, they are smaller because they are mostly playing patterns, Unreal Tournament uses Mod files in their game, there is even a tool that will convert their umx to it or xm (pretty nifty)...