Windows 8 build 7878

Build of Windows 8
OS family
Timebomb2011-07-01 (+239 days)
Works in

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.

Editions and keys[edit | edit source]

Edition / SKU Name Key
Home Premium RHPQ2-RMFJH-74XYM-BH4JX-XM76F
Professional HYF8J-CVRMY-CM74G-RPHKF-PW487

New features and changes[edit | edit source]

  • 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.

Redpill[edit | edit source]

Immersive features[edit | edit source]

  • 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 EnablePatternLogonForInternalTesting in HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion to 1, however there's no option to use it on the login screen.

Bugs[edit | edit source]

Installation[edit | edit source]

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

Out-of-box experience[edit | edit source]

Attempting to select a network type will result in a driver unload bugcheck. To fix this issue, please turn off all network adapters before booting into OOBE.

General[edit | edit source]

  • 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.
  • In the Services MMC Snap-In, Services (local) text uses the Wingdings font.
  • When right clicking a tile on the start screen and then clicking either: Open file location, Pin to Taskbar, Run as Administrator orUninstall, an error will occur saying that this file does not have a program associated with it for performing this action.

Arial[edit | edit source]

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

Personalization[edit | edit source]

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

Language Bar[edit | edit source]

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.

Gallery[edit | edit source]