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Why would it be?
Linux, BSD, macOS, iOS, Android, QNX and so on are all Unix-like operating systems. Windows is the only widely used OS that’s not Unix-like.
They were posix certified at some point.
No idea why, but microsoft did go through the hoops to get that.
In practice posix functionality did not work. But they did have a paper saying it generally should.
Like ms word and iso.
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Ah I figured the monolithic kernel would make it opposite to the unix philosophy.
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