Windows NT 4.0 build 1209

Windows NT 4.0 build 1209.1 is an unleaked build of Windows NT 4.0 that is mentioned in an article titled.

Using GetVersion to Determine to Operating System Version

Let's say that you still want to call GetVersion. What should you do? If you are running Windows NT SUR build 1209, you will see the following:


 * HIWORD(ReturnVal) = 1209 // the build number
 * LOBYTE(LOWORD(ReturnVal)) = 4
 * HIBYTE(LOWORD(ReturnVal)) = 0