Hi,
The 'units mod' from this site is actually done as a *.module file, usually that's where these go, in the main folder of Dark Crusade, then you would start the game and go through the Custom Game in the main menu to activate.
But as yet I have to come across a .module that actually works, even the ones that I have created don't.
Anyway, you maybe better off going and having a look around the Dawn of War website at Filefront and getting one of the 'mini mods' to do what you would like. Might I suggest the "adeptus collection" so you can use just the mod for the race you like, there's one for each race plus a "full" version, instructions are included.
LinkI have a mod that I created just for the Space Marines, it does a heap of stuff, makes them too powerful really but its fun. Turrets increased to 12, max weapons increased to 9, reinforced to 12, build limits removed, whirlwinds fire rate halved (now reloads in 2 seconds instead of 5 seconds), can build 2 Orbital Relays instead of 1 and holds 6 instead of 4.
Also increased unit and support caps to 50 of each.
[Edited by GlenGrainger, 2/7/2007 1:27:50 AM]