[monocasa]

Except WSL doesn't actually use any of the nt subsystem machinery in either of its incarnations.

And also, it doesn't really follow that nomenclature. Those all follow "user code target" Subsystem. Windows Subsystem, OS/2 Subsystem, Posix Subsystem, etc.

[mycall]

WSL1 used pico processes/providers, system call translation, and directly used NT Kernel Executive. I hope they resurrect it someday in the future.