no, change it IN GAME. Do that before you do anything. Make sure all your video modes and video options settings are where you want them to be, and then go in and change the conf.ini file. IL2 was designed to utilize OpenGL, and will perform MUCH better than in DX mode. TRUST ME. Do not run it in DX mode. The only time you would want to run DX mode is when you are trying to use fraps to record.
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