Windows Extra 8 build 7900

**Windows Extra 8 build 7900** is a build of Windows Extra 8. Images of this build were shared on June 2, 2022, then the build was uploaded to BetaArchive on June 8, 2022.

## Editions and keys

 Home Premium
 Professional
 Ultimate

## New features and changes

This is the first known build to feature a software-based implementation of the DWM rasterization functionalities, which eliminates the 3D acceleration hardware requirement needed for Aero effects. Additionally, the ReFS file system (codenamed Protogon) has been introduced in this build.

## Redpill

### Immersive features

Immersive Shell and Metro in general has greatly evolved since build 7870. The Metro Horizon has been removed, although a space for it still exists in the start screen, as well as its resources and DirectUI UIFILEs. Tiles are now icon-aware, and right-clicking on a tile shows a menu with several options - "Move to Other View" being among them, although this does nothing when clicked. In fact, all of the options bar the "Open" option (which opens the app without actually entering the desktop) - including such items as "Uninstall" and "Resize" - either do nothing or show an error when clicked. File search has been added, with a different UI to build 7895, although it does not seem to work. The search suggestions in the start screen now use blue text for their first letter. The Blue Screen of Death and Windows Boot Manager now support VBE2 at all times (7834 through 7898 only supported VBE2 during boot) and use a smooth font - also not covering the entire screen in certain resolutions - but otherwise is identical to Windows Extra 7.

The Windows Runtime is more mature in this build than build 7870.
Pattern logon is available if the `EnablePatternLogonForInternalTesting` DWORD in the `HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion` key is set to 1. Like the previous build, there is no option to use it on the login screen.

## Bugs and quirks

### Installation

* The messages shown when setup is starting, installing or upgrading Windows, restarting the computer or preparing the OOBE are cut off.
* This build cannot be installed in VirtualBox. It will refuse to boot with a black screen showing an error code of either 0x0000001E or 0x0000000A. This bug persists until build 8196.

### Arial

This build uses the Arial font for the title bar and watermark because of a typo in the `aero.msstyles` and `aerolite.msstyles` files.

### Desktop

When right clicking the desktop, it can take several seconds for the context menu to open.

### Aero

This build appears to have a slightly broken Windows Aero theme, with only the top portion of the window frame using the blur effect, leaving the side borders transparent.

#### Aero Glass in Home Basic SKU

The Home Basic SKU doesn't support Aero Glass borders by default, but it can be enabled by clicking on "Windows Extra 7 Standard" color scheme in Window Color and Appearance dialog from the Display control panel item.

### Windows Media Center

There's a chance you can encounter a `SYSTEM_SERVICE_EXCEPTION` bugcheck if you open Windows Media Center on this build.

### Group Policy Editor

When opening the Group Policy Editor, an error will occur that prevents the user from accessing Administrative Templates.

### Desktop Window Manager

The Windows Basic and the High Contrast themes do not properly render due to the enforcement of the DWM Aero theme.

### Language switcher

This build uses both the old and the new language switcher at the same time.