If you're like me, when you look at a game, you check to see if the OST is even available on gog.
They made Dawn of Man soundtrack free for all. Not sure why they didn't include it with goodies.

ogg format
http://madrugaworks.com/dawnofman/files/DoM_Soundtrack.zip

Note: This will open a download in zip/rar format. It has 21 tracks, cover, and a readme.