Huh. I was going to question whether that was even possible, but apparently https://github.com/marchaesen/vcxsrv , http://www.straightrunning.com/XmingNotes/ , and https://x.cygwin.com/ are all based on Xorg, so I guess if you wanted you could likely get Xlibre to build for Windows. But... Why? CDE isn't really something that makes sense nested inside another system, and AFAIK modern Windows is pretty hostile to replacing DWM (or wherever their GUI is these days).