Turns out this is not true. Confirmed that os/2 2.0 was a skinning and compatibility layer for NT it came out for OS/2, not with windows and not from Microsoft. It came with OS/2 and from IBM. No idea whether it supported HPFS+ but it was not a subsystem.
No, what you quoted in your comment you are replying to is accurate. What you are saying in this comment isn’t.
> Confirmed that os/2 2.0 was a skinning and compatibility layer for NT it came out for OS/2,
This is confused. OS/2 was not a “skinning and compatibility layer for NT” it was a completely separate operating system.
I think at one point NT was going to be OS/2 2.0, and then it was going to be OS/2 3.0 - but the OS/2 2.0 which eventually ended up shipping had nothing to do with NT, it was IBM’s independent work, in which Microsoft was uninvolved (except maybe in its early stages).
