Comment by KyleJ61782

Using the NTDLL calls breaks stuff because NTDLL doesn't understand anything about the overlaid subsystems. NT was originally designed to support multiple subsystems in addition to Win32, like the Interix (POSIX compliant) subsystem and the OS/2 subsystem I believe. I think (I could be wrong on this) that this was possible by switching the system call table depending upon which process was currently active (doable by switching the system call vector).