I just downloaded that meshwork program for mac an it look easy to use, but my queston is it wont let me import .skd files , btw I want to make weapon mods for Medal of Honor.

I suggest you try wings3D or cheetah... they are definitely better alternatives in my opinion to meshwork.

Also, perhaps try Blender?

I just downloaded Wings3D and I tried cheetah, they wont import the model i want to edit...
its a medal of honor model file the extention is .skd i tried changing the ext but no go... what do I do is there a converter out there to convert odd model files to usable one......