I downloaded a really cool stormtrooper commander skin and when I opened it up the tga files were called imp_inf_trooper_remapped. When I opened it with photoshop it was different to the normal way that I skin and when I used it ingame it looked terrible! Can someone help me?

try adding it to the stormtrooper skin.

i don't know which skin you downloaded but surely is the remapped stormtrooper skin version so you must use the remapped stormtrooper model from DarthDUCK