Why is there no BSDCNC?

I don't know where I heard about Windows NT, there isn't any mention of it here:
tsapps.nist.gov/publication/get_pdf.cfm?pub_id=821651
However the very first implementation described there seems to have run the GUI on a Windows PC.

That is the first ever GNOME GUI on some GNU Linux version on that document.
Also searching that document for windows or NT shows nothing.

DOS is also not mentioned in that document.

Windows NT is briefly mentioned here:
en.wikipedia.org/wiki/LinuxCNC

and here
linuxcnc.org/docs/html/common/emc-history.html