It furthers the development of Microsoft® ESP™ while maintaining compatibility with Microsoft Flight Simulator X. Therefore, many thousands of. Microsoft Flight Simulator X is the most popular flight simulation After doing that close Command Prompt and try installing the game again. In this example, the Microsoft Flight Simulator X (FSX) is used, but its predecessor, Flight Sim , and other titles will have similar setup. IT and FSX Pros, I am a full on pilot who uses FSX to sharpen my skills, yes a nerd pilot. My Hd died, I installed a new sshd, and win xp sp3.