It was designed for portability from the beginning and was ported to x86: > Various versions of NT family operating systems have been released for a variety of

It was designed for portability from the beginning and was ported to x86: > Various versions of NT family operating systems have been released for a variety of processor architectures, initially IA-32, MIPS, and DEC Alpha, with PowerPC, Itanium, x86-64 and ARM supported in later releases. > In order to prevent Intel x86-specific code from slipping into the operating system, due to developers being used to developing on x86 chips, Windows NT 3.1 was initially developed using non-x86 development systems and then ported to the x86 architecture. This work was initially based on the Intel i860-based Dazzle system and, later, the MIPS R4000-based Jazz platform. Both systems were designed internally at Microsoft. https://en.wikipedia.org/wiki/Windows_NT https://en.wikipedia.org/wiki/Windows_NT