If you are in windows, you can play these files in any of these players:

Winamp (any version, even very old versions)
XMPlay
Schism Tracker

In linux, they will play in just about any audio/media player, and there is a player called BASS which will play them accurately in linux, Windows, Mac OSX, and even iPhone. If that's not enough, here is a much bigger list of players/converters.

These files are [legally] free and free to distribute.

Falcon is a Polish producer (Jacek Dojwa) who used FastTracker 2 in the late 90's and released a lot of songs in source format (*.xm). He later went on to form the band Husky.

Falcon - 'Twixt Cup and Lip
Falcon - French Connection
Falcon - Nicollete
Falcon - La Petit Prince
Falcon - Sofa Surfin'

Enjoy.