Windows NT was the product of the systems architect of Digital Equipment Corp VMS (Virtual Memory System)
http://windowsitpro.com/windows-client/windows-nt-and-vms-rest-story
A big problem for PTC, and all other CAD developers at the time, was that each UNIX variant had it's own graphics and GUI development tools, so PTC appears to have created their own version that used the lowest common denominator of those that were available** Even if PTC had started with Win-NT it would not solve the problem of TTFs for PTC because the underlying OS doesn't provide the sort of conversion PTC needs.
I do wonder if things would have been better if Display Postscript, which found a home on NeXT, had been available earlier. https://en.wikipedia.org/wiki/Display_PostScript At least the printed and screen versions of graphics could have been identical.
**Also see MOTIF, X11, and CDE. Remember at the time there was no UI standard beyond a command line and terminal emulator and each company was trying to put their own face on their own UNIX variant. Good times.
