A) Most of the OS is portable code (go and look at the list of platforms which Windows NT and later have been sold on) B) Microsoft's x86 emulation on ARM is s

A) Most of the OS is portable code (go and look at the list of platforms which Windows NT and later have been sold on) B) Microsoft's x86 emulation on ARM is surprisingly good (based on my personal experience of running Windows 11 on Parallels on an M1 Mac)