Windows Longhorn build 4038

Windows Longhorn build 4038 is a Milestone 6 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. It was leaked on 2020-01-30 in the seventh set of 33 other Longhorn builds, along with its server counterpart.

Even though it visually looks similar to build 4033, this build has a working 3D View with Carousel and Panorama. Desktop Composition Engine also works properly again and now renders Windows Aero opaque and glass borders, but it has serious rendering problems and fails to redraw applications unless they are resized.