Windows NT and the systems based on it are not based on MS-DOS, but use a virtual machine, NTVDM, to handle the DOS API. [0] https://en.wikipedia.org/wiki/DOS_

Windows NT and the systems based on it are not based on MS-DOS, but use a virtual machine, NTVDM, to handle the DOS API. [0] https://en.wikipedia.org/wiki/DOS_API https://en.wikipedia.org/wiki/DOS_API Games like Doom still run on Windows because of this DOS virtualization.