As far as I can tell, IsoComp/2 for WIN32 should behave the same between OS/2 and WIN32, though due to the different APIs there, there might be incompatibilities I'm certainly interested in hearing about.
I did the port under NT4 SP5, and though I was using the oldest version of the APIs some APIs are not available on WIN9x so it won't work there. As always, Microsoft's inflation of APIs for different versions of Windows is a hell, and shows that due to their monopoly they can force what they want, and whatever they do looks shortsighted!
The port IsoComp/2 to windows is part of the XComp/2 source code archive, both for the modified source code and the exectuable itself.
Note: You have to have access to an OS/2 PC to decrypt the encrypted source code archive, because I provide the decryption executable only for OS/2. These tools are for OS/2 users who are forced to used Windows sometimes, but not for users that uncritically help to extend the power of the evil's empire monopoly!