The old code was confined to 32 bit application 4GB virtual memory.
While it contains FSX components that could be salvaged it’s mostly rewritten for more modern hardware.
I don’t care what anyone says…FSX was still incredible tech and before it’s time even in 2006.
FSX was amazing for its time and so is MSFS.
Shout out to original ACES Team for paving the way🍺