I don't follow.
In the 90s there were two branches of Windows being developed which had rather different internals. The Windows 3.1, 95, 98, and ME line were more focused towards consumer use, were a 16/32 bit system, and based on MS-DOS. The other branch went under the Windows NT designation and included NT 3.1, NT 4.0, and Windows 2000 (5.0). These were originally developed for business and server use in mind. NT was not based on the MS-DOS architecture and at the time was designed to be an exclusively 32-bit system.
After the utter failure and public backlash from the release of Windows ME, and for other technical reasons, that branch of Windows development ceased and every version from XP onward was based on the development of the NT line.
Fun history lessons aside that's why I called the Windows 9x line non-canon lol.