I noticed the "default" or "stock" skins the game comes with are not in the skins folder. So, just out of curiosity, where are they?!
If you just want to have a look at them in Photoshop:
Download unGTP for IL-2 here.
Unzip and drag unGTP-IL2 into your install directory (Drive: X > IL-2 Strumovik Battle of X > Data).
In the Data Folder you'll see numerous files: Skins.gtp - Skins5.gtp. These five gtp files contain the aircraft textures.
Drag one file at a time over unGTP-IL2 and it will create a new directory in the Data folder called (null).
Inside the (null) folder are the associated a