I've gone ahead and added Windows 1.x for two distinctly non IBM PC compatible platforms.
These are for the DEC Rainbow 100 and The Zenith Z-100 (110/120).
Do not confuse the regular Zenith OEM with the Zenith Z-100 version. The regular Zenith OEM is for their later IBM PC compatibles.
The DEC Rainbow was primarily popular in shops that already made use of other Digital Equipment Corporation systems, such as PDP or VAX systems. Z-100s were popular in electronics education as they could come in kit form.
Neither of these share anything in common with the IBM PC other than the use of an x86 CPU. The Rainbow even uses a different kind of floppy drive. Both have "ports" of MS-DOS that only runs on the respective hardware.
Similarly, these versions of Windows will not run on an IBM PC style system.
The fascinating thing about this is that theoretically, Windows on these non-PC systems should be able to run any Windows 1.x specific software.
And this was probably among the last major software avaialble for such 8088/8086 non-pc compatibles. By 1986 the industry was pushing towards full IBM PC compatibility, soon aided by cheap Taiwanese clones.
It is interesting to speculate what might have happened if at least business application had been able to adopt Microsoft Windows earlier. Perhaps lack of hardware compatiblity would have been less of an issue.
I've decided to spotlight these versions partially because they both desperately need a full redump, and it is not clear if these are functional. Additionally, the DEC Rainbow version looks like a bit of a mish-mash, but it was reportedly built by DEC, not Microsoft. It is not even clear if the DEC Rainbow version was shipped as a boxed product.
Any testing on real hardware would be most valuable. As far as I know there are no fully functional emulators for either of these platforms.
If better versions should become available we will happily update them.