Try OpenMPT (if u'ld like)
I use it 2 play .IT, .S3M, MOD etc - IT files play nicely
But u can also edit them...
Note about this music set: Not all music is there, also the music to the alien episode of the first level is incomplete (Correct me if im wrong).
I was also able to run this game on my current system with DosBox.
Sorry, im just one of those people that writes alot of useless information and writes extremly long posts. Im also one of those people that expects the best, and gives poor ratings.