Forgive me if this is old news, but accidentally stumbled upon this the other day. I downloaded some skins from the Commonwealth Aircraft Corporation with a view to updating the stock skins in my stock install. Anything I download with regards to CFS3 goes into the CFS3 folder in My Documents. I unzipped one of the skins(A Tempest) just to look at it in Photoshop. When I fired up CFS3, the new skin was applied to the aircraft without me actually applying the skin manually! Out of interest I looked in the actual CFS3 folder(where the cfs3.exe is located)and the stock textures had not been overwritten. Taking this a bit further i deleted the custom skin and the stock Tempest returned to normal. So, now I have a skins folder in my personal CFS3 directory and rar archives with a few skins in for each aircraft and just unrar them to overwrite as required. Hope this is makes sense and is of help to somebody.