C:\Program Files\Eagle Dynamics\DCS World\Mods\aircraft\M-2000C\Textures\M-2000C-CPT
Thats for the standalone. I think using steam you need to go to the DCS steam directory and follow the folders from "DCS world".
Not sure if intended or not but whenver you are on the spectator slot you can see both sides and spectate all units, including players. Just noting as it wasnt like this before the most recent update.