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by rossy 3667 days ago
Cygwin programs technically run under the Win32 subsystem, but they're not that cleanly layered. The runtime calls into a lot of Nt* functions, including undocumented ones. midipix (which another commenter mentioned) is another Unix-like environment for Windows that also runs under the Win32 subsystem, and apparently it has successfully implemented a real copy-on-write fork() on top of undocumented NT syscalls, so it's definitely possible.