It’s because “Windows Subsystem” is a thing. There was also a “Windows Subsystem” in the past that provided POSIX api’s and others. https://docs.microsoft.com/

It’s because “Windows Subsystem” is a thing. There was also a “Windows Subsystem” in the past that provided POSIX api’s and others. https://docs.microsoft.com/en-us/cpp/build/reference/subsystem-specify-subsystem?view=vs-2019 https://docs.microsoft.com/en-us/cpp/build/reference/subsyst... After WSL was dropped in favor of the VM approach in WSL2 it’s just a zombie name though I think?