Actually, if memory serves, GW had PC games out before Blizzard scooped up the RTS market. That's a moot point, however, and I could be wrong on that. Even so, they
DID all but steal concepts from GW. Hell, they are still doing it. Look at the new Terran unit in SC2, the
Reaper. Minus the chainsword and melee combat, it appears to be in just about every other way a mirror image of your standard Assault Space Marine, including the ability to toss high explosive detpacks (WH40K Meltabombs vs SC2 D8 charges) at hardened structures and targets. If this unit wasn't lifted from WH40K, it almost certainly came from Dawn of War, or I'll eat my shirt and Bob's your uncle.