Windows XP build 3790.1173

Windows XP Professional x64 Edition build 3790.1173 is a beta build of Windows XP Professional x64 Edition. This build was shown in the Japanese IT news site PC Watch in an article. It demonstrated the capabilities of the AMD64 environment on Windows and how it compared to the Itanium-based variant. It also shows application differences between x86 and x64, such as Internet Explorer and Windows Media Player. As of 2023, this build has yet to be found. It is also the first build to include Luna theme, which was absent in earlier builds and in all Itanium-specific releases of Windows.