I think i got it to work, load the .fmp, then find it in textures.big and load the .dds file found in the forum link i gave you, then re-size the sword to 1.0 on the (float)Scale. The original size is 0.85 but with that size the sword is still messed up at angles.
You can try it yourself to see if its good. But if you can make it better then by all means make it so. Do you kno how to switch the weapon around? I noticed the sword is held on the wrong side
o, i think u also have to find it under "OBJECT" and go under graphic and change the mesh from the iron sword to the frostmourne mesh