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by FateOfNations 388 days ago
A "Windows Subsystem" is a concept that dates back to the original Windows NT line of operating systems. Historically, there've been a number of supported "Windows Subsystems", essentially APIs for the kernel. In Windows NT 3.1, there were multiple subsystems: Win32, POSIX, and OS/2, plus a separate one specifically for security.

https://en.wikipedia.org/wiki/Microsoft_POSIX_subsystem

While WSL2 isn't implemented as an architectural sub-system (it uses a VM instead), WSL1 was far closer to the original architecture, providing a Linux compatible API for the Windows kernel.