Windows Longhorn build 4048

Windows Longhorn build 4048 is a Milestone 7 build of Windows Longhorn. On 23 January 2020, this build was listed on a thread by UX.Unleaked blog founder Grabberslasher to be released to the BetaArchive FTP server, and was released in the third set of his 33 Longhorn/Vista builds on 26 January 2020, alongside multiple compiles of build 5000 and build 5001.

A part of the build's installation media is corrupted, including the install image itself, which renders it impossible to install without excessive patching.