This flight simulator is "protected" by detecting the 4channel +x buttons "joystick" it's sold with, it's like a RC transmitter.
The joystick part works great in Linux alone.
The realflight.exe file cannot test it's other functionality, and so it's denying to fly.
Solution: use EMU.EXE for realflight, - it's a emulator that allows flying with any and also the original controller by fooling the test.
I guesss Emu.exe is a loader, it needs to load and modify memory of realflight.exe.
The problem is that it don't see realflight.exe and can't launch it for some reason ..
I hope somebody can look at this, and maybe find a solution, Realflight would be very fun..