Hm...
Contemplating that, Disturbing, I have a feeling that XFoob is asking how to get some of the custom content in my game, into FPS Creator (for him).
If that's the case, there's no answer. All custom content in my game has either been released free to the community (in which case, you'll need to find it yourself on these forums), has been given to me by friends, or (in the case of custom textures) has been made by me, and in almost all cases would serve no purpose to any user here (seriously, who on here needs a painting of the mansion in my game? I doubt anyone would...).
Evil has a new name. Demo out now!