IT SUPPORTS THE MYSTERIOUS GUIDE BUTTON! It is a Gamepad class for getting input from XBOX 360 controller (it uses windows.h and Xinput, so it requires Windows (:D) and DirectX 9 SDK (or higher).
This is my custom joystick configuration for Xbox 360 controllers for FlightGear Flight Simulator ... Help needed.) (The Windows driver does not report the Xbox button to FlightGear.) ...