To clarify, it sounds like what Microsoft has added to Windows 10 is a Linux ABI.
This has been done before with other x86 OSes: FreeBSD has had 32-bit ABI compatibility for at least a decade (https://www.freebsd.org/doc/handbook/linuxemu.html), and the "lx branded zone" for Solaris has it as well (https://docs.oracle.com/cd/E19455-01/817-1592/gchhy/index.ht...).
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