i am sure i didnt make any mistake but i checked it 10 times to be sure, i created new directory called "units" in the warcraft folder i put the file you you gave me in it with out changing its name or even open it, but still the in the worldedit in the game interface all stayed the same without any change.
are you sure i dont need to regester this file some where to tell the worldedit to load it when it starts?