Just copy the .iwd file into the /main folder in the MW3 game folder!
! ! IMPORTANT ! !
DONT USE WEAPON SKIN IF YOU WANT TO USE THE CAMO!
It wont crash the game, just the camo will not be visible.
These are the camos which will be in game.
@Mortyka Wait so which folder do i put it in, the steam one that says mw3, and if so, which folder?
@Mitchxll if you want to use it only in Pluto put the downloaded .iwd file here \AppData\Local\Plutonium\storage\iw5
But if you want it in your base game put the files into the :
if steam then in \steamapps\common - there should be the MW3 folder, in it into the \main folder
non-steam - where the game is installed inside the game folder \main
drag-drop the .iwd and the game should load it itself