Windows Longhorn build 4048

Windows Longhorn build 4048 is a Milestone 7 build of Windows Longhorn. On 2020-01-23, 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 2020-01-26, alongside multiple compiles of build 5000 and build 5001. This build's  is missing some of its files due to corruption, making this build uninstallable. However, a user on BetaWiki by the name of Lucasm had successfully installed this build on a hypervisor.

Setup
Although it could be possible that 4048 introduced the new slate setup layout, it isn't 100% known at this stage, due to 4048's ISO corrupting merely at DVD:\Sources\install.wim, which one of the 3 images inside it is setup itself.