Well, I've just had the best 2 hours of offline flight simming I can remember...

[SEE]

I can tell you where to look but cannot remember the exact text for DX9. But at least you can check that it does not read the same as the line highlighted below (which is for DX10).

Open the file named 'conf' using notepad, you will find it in:

MyDocuments- 1CSoftClub - IL-2 sturmovik cliffs of dover.



[BOB]
EpilepsyFilter=0

[window]
DepthBits =24
StencilBits=8
DrawIfNotFocused=0
SaveAspect=0
Render=D3D10_0