I make a vanilla install and I do not receive the message. I will slowly add features and files to the game and see when the error message occurs.
Thudman: FYI - I have edited the CFS3.exe (just for my use only mind you) to NOT need the Ju88, Me109, and P47D25 for the game to run. I have made an install that has revised the frontline.xml file, removed all spawns and missions, that call for these planes - as an educational experience mind you. I have removed all vanilla planes and the game has run just fine. Just in case I will make the vanilla a test bed for this mod and see if there is something I have neglected to revise (just to learn).
Слава Україні! Героям слава!