The original Windows NT kernel was written in C. Dave Cutler liked C and did not like C++. I believe the graphics (not GUI) portion of Windows NT may have bee

The original Windows NT kernel was written in C. Dave Cutler liked C and did not like C++. I believe the graphics (not GUI) portion of Windows NT may have been partially written in C++. Also, a lot of the Windows management code (message processing, RegisterWindowClassEx, CreateWindow, SendMessgae, PostMessage, GetMessage, etc.) probably came from Windows 3.x . This code was also written in C.