Windows Vista build 5000 (vbl core.040803-2000)

Windows Vista build 5000 (vbl_core.040803-2000) is the earliest known post-reset build of Windows Vista, based on a work-in-progress version of the Windows Server 2003 Service Pack 1 codebase. Prior to being shared, there were some alleged screenshots of this build circulating on the internet, but they are fake due to containing the Bliss wallpaper with a bull, which is not included on the actual build. On 23 January 2020, this build was listed on a thread by UX.Unleaked blog founder Grabberslasher to be released to the BetaArchive FTP, and was released in the third set of his 33 Longhorn/Vista builds on 26 January 2020, alongside build 4048, other compiles of this build, and build 5001.

There are not much differences in terms of features compared to build 3790.1232, however the  and About Program banners in the Professional SKU now has the "XP" changed to "lh", and support for the Multilingual User Interface (MUI) feature has been implemented; although it is not functional as the resources located in the MUI are duplicated in the actual file. The rewritten Event Tracing for Windows architecture already appears to be implemented in this build to an extent.

Bugs

 * The visualizations in Windows Media Player are broken, and other compiles of build 5000 and build 5001 also have this bug.
 * Alchemy visualization in Windows Media Player won't appear unless the user runs.
 * The animated "Question Mark" assistant in the Out-of-box experience (OOBE) does not appear until reaching the second page. This is maybe due to bugs in the Microsoft Agent technology itself.