Ive been around the forums for a little bit and I havent heard much positive results with the guys who have FPSC and Darkmatter... I know it comes in 3DS format and there is a converter on the forums that can convert them... I don't know about the .x format as I dont own a copy of Darkmatter myself...
But the package from my understanding was attended for DBPro but like any model out there if your determined enough you can convert it and build your fpe or fps file pending on its situation and import it to your fpsc and go through the trial and error deal...
Have you downloaded your CLiPs today.