Windows Server 2003 build 3790

Windows Server 2003 build 3790 is the official RTM build of Windows Server 2003, which was released on 24 April 2003. The source code to this build, along with Windows XP build 2600.1106, was leaked on 23 September 2020.

AMD64 Support
The source code to this build has code for AMD64 and the code can be compiled for AMD64, but booting a build made for AMD64 often fails. However, a user on the BetaWiki Discord server, Jurta, successfully booted one, but it lacks proper GPU drivers, and many of the components don't work.