I don't recall any "Windows 2.0", but rather Windows 286 and Windows
386.
I should also point out that regardless of the processor Windows 286
ran in real mode without support for XMS. Windows 386 ran under EMM386
which put the processor in Virtual mode. The windows executable was identical
to the 286 version and memory beyond 640k was accessed via the EEMS 3.2
specification (EMS 4.0 didn't yet exist).
Eric