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, which was uploaded on 4 June 2021. Prior to being shared, seven screenshots of this build were included with the original upload of build 7746.

Editions and keys[edit | edit source]

Edition / SKU Key
Home Premium RHPQ2-RMFJH-74XYM-BH4JX-XM76F
Professional HYF8J-CVRMY-CM74G-RPHKF-PW487
Starter 7Q28W-FT9PC-CMMYT-WHMY2-89M6G

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 7814 now includes a progress bar and has the ability to go online to check for updates.
  • The This copy of Windows is not genuine watermark no longer appears on the desktop.

Redpill[edit | edit source]

Immersive features[edit | edit source]

  • The Start screen tiles are now colored, and the Metro Horizon has been removed, although its resources are still present in twinui.dll.
  • 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.
  • A new OOBE has been introduced.
  • A new AutoPlay dialog has been added, which is just the exact same as Windows 7 but larger.

Bugs and quirks[edit | edit source]

Installation[edit | edit source]

  • The messages shown when setup is starting, installing or upgrading Windows, restarting the computer or preparing the OOBE are cut off.
  • This build can't be installed or run on newer versions of VirtualBox, as a bugcheck will occur. This bug persists until build 8176.

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

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[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.
  • 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[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.

Aero[edit | edit source]

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.

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.

Redpill[edit | edit source]

Enabling Redpill after upgrading from build 7875 will cause Windows Explorer to not respond when trying to load the Start menu and enter a crash loop. Using Redlock option 2 instead will enable Redpill features excluding the Start menu.

Desktop Window Manager[edit | edit source]

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

Gallery[edit | edit source]

Setup[edit | edit source]

Metro OOBE[edit | edit source]

Interface[edit | edit source]

Images prior to being publicly shared[edit | edit source]