Windows Longhorn build 4020

Windows Longhorn build 4020 (idx02.030507-1155) is a Milestone 5 build of Windows Longhorn. A screenshot of the build was shared on the BetaArchive Discord server on 27 November 2018. On 3 December 2018 this build was uploaded to the BetaArchive FTP server, along with build 4032.

Unlike other Longhorn builds, it was compiled in evaluation mode, and can be installed on the current date. Once the timebomb is triggered, Windows still functions, but a  error message will show up that this build must be activated. Additionally, the timebomb is extended to 445 days, being one of the "Longhorn" builds that has the longest timebomb.

Setup
Although setup mostly resembles that found in build 4017, Setup now has a new page included for whether you would like to use an advanced installation or upgrade, however, builds 4000 to 4017 are minimum for upgrading.

New features and changes
This build is very similar to build 4015 (main) and build 4017, however there are some minor changes:


 * Notably, the notifications appearance has been updated, which features a more sleeker design and the notification icon on the side bouncing up and down when hovered.
 * The Windows Explorer has been updated to no longer leak memory when the Windows Sidebar is enabled. WinFS also works in this build, just like in 4015.
 * The OOBE is now completely skipped; after the hardware portion of setup, the system logs on to the Administrator account.
 * This build changes the "Longhorn XP" references to simply "Longhorn", such as in the desktop watermark. In build 4029 (main), it was renamed into onghornLay rofessionalPay (into Pig Latin strings).
 * The sidebar is given a minor change to take up the whole side, including the bottom of the taskbar, shifting the time to the left of the sidebar instead of under.
 * Certain tiles, such as Windows Media Player, have been removed - while other new tiles get added.
 * MyTVApp now functions again - however there no longer is an Avalon Trust Manager pop-up, and it isn't as functional as before.

Hidden dialogs
There are a few dialogs that cannot be accessed normally. They are:


 * Security preferences - Allows you to set preferences for security. It does not seem to have any effect.
 * Installer warning dialog - Asks for your permission on whether to run an installer or not that is not trustworthy.
 * File resolve dialog - A new dialog that appears whenever a new file moves to a specific place where another file with the same name and file extension already exists.
 * Help and Support Center - There is an early version of the Help and Support Center in this build, it can be opened by running.

Hidden sidebar tiles
There are a few sidebar tiles that are disabled by default in this build. They are:


 * RMA Test Tile - In this build, it only shows the title of the tile, and nothing else is there.
 * Longhorn Status - By default links to
 * Messenger Status Tile - This tile only works if you are using Windows Messenger. You cannot use MSN Messenger with this tile. Also, this tile does not work with Windows Messenger 4.0, you will need 4.6 or 4.7 for it to function correctly.

Installation

 * Many drivers aren't installed by default during the hardware portion of setup and have to be installed manually.
 * On some installs, once copying files has completed, setup will fail to create a  file. Although booting will still be possible,   will default to.
 * The hardware detection portion of setup may crash, and an error message may appear as well. Simply press ALT+TAB to access the error message, and click OK. This will, however, skip the Out-of-Box-Experience.

Upgrading

 * On some machines when logging in after the first reboot when upgrading from Windows Longhorn build 4017 the system will bugcheck with the code.

Desktop Composition Engine
The Desktop Composition Engine does work correctly in this build, but isn't enabled by default and requires some registry settings to be imported for the DCE server to be made active, for the window manager entry point to be set, and for the DCE capability to be made visible in the UI.

Copy the text below into a .reg file, and then import it into the registry: Reboot after importing the reg file, then go into Display Properties and then the Advanced page under Settings, then enable desktop composition in the same way as prior builds of Longhorn.

General

 * The Microsoft Windows Storage Engine crashes upon logging in.