Windows 8 build 7878

Windows 8 build 7878 is a build of Windows 8. Seven screenshots of this build were included with the original upload of build 7746. It was later shared on the BetaWiki Discord server on 4 June 2021.

New features and changes

 * The File History feature, originally known as History Vault, has been introduced in this build.
 * The modern setup client first introduced in build 7850 now includes a progress bar.

Immersive features

 * The Start screen tiles are now colored, and the Metro Horizon has been removed.
 * Right-clicking on a tile now shows a menu with several options.
 * Pattern logon is available if you set  in   to 1, however there's no option to use it on the login screen.
 * A new OOBE has been introduced.
 * A new AutoPlay dialog has been added, which is just the exact same as Windows 7 but longer.

Installation
The messages shown when the Setup is starting or restarting the computer are cut off.

Out-of-box experience
Attempting to select a network type will result in a driver unload bugcheck. To work around this issue, remove or disable any network adapters before booting into OOBE.

General

 * If using VMware Workstation versions 15.x or above, attempting to restart or shutdown in this build will cause a softlock. To fix this, use the Power menu from the VM section.
 * Certain visual elements in select MMC snap-ins (such as Services) may use the Wingdings font.
 * An unassigned file association error may occur if certain options in the Start tile drop-down menu are selected.

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

Personalization
Changing personalization options may occasionally crash File Explorer. This is caused by  and can be fixed by replacing the file with a copy from build 7875.

Language Bar
The new language bar is mostly broken in this build and only works on rare occasions. It may occasionally spawn an empty, non-functional button between the notification area and the current date/time.

Desktop Window Manager

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