Windows Longhorn build 4031 (main)

Windows Longhorn build 4031 (main) is a Milestone 5 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, and was later released in the ninth set of his 33 Longhorn/Vista builds on 1 February 2020, alongside the main lab compile of 4085, the x86 version of 4083, the Lab06_n compile of this build, its Lab07 Server counterpart and build 5520. This build is currently the latest leaked Milestone 5 build and therefore still uses the wallpaper from the aforementioned milestone.

Setup
Setup is practically similar to previous Milestone 5 builds.

New features and changes

 * A new UAC prototype has been added. This can be found in the Help and Support Center, via pressing the Longhorn Help Place button. Although pressing both yes and no will open up an Internet Explorer process, pressing yes will show up what would've been an Avalon Help Center, however it just throws out errors.
 * The desktop also has a new icon, File a Longhorn bug, which leads to an internal webpage.

Bugs

 * Upon logging in, an error message will appear, stating that the operating system recovered from a serious error.
 * Many drivers aren't installed by default during the hardware portion of setup and have to be installed manually.