I keep coming across the claim that Windows NT and 2000 can run OS/2 programs (due to the shared history between IBM and Microsoft). And indeed, it works – to some degree:
This compatibility layer only applies to 16 bit OS/2 1.x programs:
https://en.wikipedia.org/wiki/Architecture_of_Windows_NT#OS/2_environment_subsystem
32 bit OS/2 2.x programs don’t run:
I wonder how many text mode 16 bit OS/2 programs still existed when Windows 2000 came out. 🤔 Was it really worth keeping this subsystem around for so long?