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Still no idea?

Is there any way to modify an. exe file, and if son how? Maybe one can have access to the DGen.exe code and update it, adding planes and maps?

This sounds like a job for QTim - a PM to Mr Jolly on this subject might be the way to start. The only problem I can see is that none of us knows what Starshoy will do with the 4.09.exe. It might be better to wait until 4.09 is out and we have the very last official version of DGen.