Those are not a part of the API contract in case with NT kernel, though, unlike Linux. Also, there are OS-provided shims in ntdll.dll (which, by the way, isn't

Those are not a part of the API contract in case with NT kernel, though, unlike Linux. Also, there are OS-provided shims in ntdll.dll (which, by the way, isn't a part of Win32 platform API, but a part of the NT kernel interface).