Calling win32 from other languages is supported, calling it from assembly is supported (as long as you use the calling convention properly, obviously), using nt

Calling win32 from other languages is supported, calling it from assembly is supported (as long as you use the calling convention properly, obviously), using ntdll to bypass the win32 API is not supported. Basically on Linux the syscalls are the equivalent of Win32 except much narrower in scope.