I still have a X-Box copy of the game which I bought for my 360 years ago (since it was backward compatible). I did have a PS2 version which Fox gave to me way back at release but have no idea what happened to that. I don't even know why I got an ingame credit for Extinction since I didn't beta-test it (unlike AvP2 and Primal Hunt) and I provided no development input (like Predator: Concrete Jungle, which I didn't get a credit for).
Still, it probably would have fared much better on PC. Back when it was released, RTS games on consoles were still fledgling territory for the genre.