When you plug it in to your usb port, windows (any) will see it as a joystick, and all its buttons and such.
You won't have the ability to map the ministick to the mouse (or map anything to anything else). but in Aces, now that it supports 32buttons, and a lot of axes and such, using the software isn't a requirement. At least, I'm not using it now (in winME). You will still be able to map the ministick to any other axis that you can map in AH (like views, throttle, rpms, whatever).