the VDM used for 16-bit Windows on WinNT required "Virtual 8086 Mode" which is not accessible while in long mode (64 bit)[1] Now Microsoft probably could have

the VDM used for 16-bit Windows on WinNT required "Virtual 8086 Mode" which is not accessible while in long mode (64 bit)[1] Now Microsoft probably could have engineering a real solution to continue DOS/16-bit support - either via VT-x or just a different solution. But it would have cost engineering hours - for what is a diminishing return. [1] - https://en.wikipedia.org/wiki/Virtual_8086_mode#64-bit_and_VMX_support https://en.wikipedia.org/wiki/Virtual_8086_mode#64-bit_and_V...