Windows Longhorn build 4038

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

Setup
Although setup is mostly similar to previous builds of Longhorn, the cancel and back buttons have been removed, now making the top-left back and top-right exit buttons the only choices. Upon hovering over buttons, the icon of your mouse now changes as well. The upgrade page has also been updated, now having the buttons organized vertically, rather than horizontally.

Features and changes

 * The 3D views have been improved in usability when compared to 4033.main. The spinning icons have returned and the 3D views are interactable. However, it is still not possible to use Panorama to open files or folders.
 * It is now possible to move an Explorer window by clicking and dragging on free space within the upper navigation pane. In addition, double-clicking empty space on that pane also minimizes the window.

DCE
The Desktop Composition Engine now enables Direct3D shaders on capable hardware. Since DCE now has working Direct3D shaders, the new borders are now shown, which weren't found in earlier builds containing a working DCE. Although by default the borders will be opaque, you can get transparent borders upon renaming plex.theme and plex.msstyles to aero.theme and aero.msstyles. Afterwards, you will need to open up command prompt, and then type the following two commands: net stop winux net start winux Once done, you can enable DCE with the  command, although it requires a compatible WDDM graphics driver.

Bugs

 * While this build's Desktop Composition Engine can show the Aero borders, it suffers from rendering glitches that fail to refresh a window's graphical content unless the window is resized.
 * The preview pane may not show the common task options.
 * This build can't be installed from CD boot as is. You must use the WinPE from a different build, or upgrade from a previous build.
 * The hardware portion of setup will crash just after the second reboot, and you will be instantly taken to the desktop.