As mentioned elsewhere on this page, Windows NT had fork from the start. Vide NtCreateProcess and what happens if an image file is not explicitly supplied.

* https://computernewb.com/~lily/files/Documents/NTDesignWorkb...

▲

dcrazy an hour ago | parent [-]

NtCreateProcess doesn’t accept an image file parameter.

	▲	JdeBP 11 minutes ago \| parent [-]
		You haven't read the doco. I did point to some. The image file is supplied (or not) via the section object. Think it through. Windows NT supported fork from the start in its POSIX subsystem, that subsystem was layered on top of the Native API, and this is the Native API mechanism that the POSIX subsystem employed. Although it took until Gary Nebbett for someone to publicly show how, even though people knew informally back in 1993.