And as Windows NT was a pure 32 bit OS, where the Dos based Windows were 16/32 bits.
Windows NT was designed by Dave Cutler and released from July 27, 1993.
https://en.wikipedia.org/wiki/Windows_NT
By that time there were already 5 editions of Dos based Windows: 1/2/3.0/3.1/3.11.
The first Dos based Windows was released much earlier: November 20, 1985
https://en.wikipedia.org/wiki/Windows_1.0x
To add to the confusion there were a Dos based Windows 3.0 and 3.1 and a Windows NT 3.0 and 3.1.