Windows 8 build 7878

Build of Windows 8
OS familyWindows NT
Version number6.2
Build number7878
Build labwinmain
Compiled on2010-11-04
Expiration date
Timebomb2011-07-01 (+239 days)
About dialog

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 downspace 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]

General[edit | edit source]

  • Shutdown or restart will cause a softlock when running this build in VMware Workstation 15 or newer. This can be worked around by using the host's Power menu.
  • Running this build in VirtualBox with the Hyper-V paravirtualization interface enabled will result in a bugcheck.
  • Certain visual elements in select MMC snap-ins (such as Services) may use the Wingdings font.
  • The name of the floppy disk drive driver remains in pseudo-language.

Setup[edit | edit source]

  • The last word of status messages shown when starting Setup and before the computer reboots into OOBE is cut off.
  • 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.

Shell[edit | edit source]

  • Enabling Redpill after upgrading from build 7875 will cause Windows Explorer to not respond when trying to load the Start screen and enter a crash loop. Using Redlock option 2 instead will enable Redpill features excluding the Start screen.
  • An unassigned file association error may occur if certain options in the Start tile drop-down menu are selected.
  • 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.
  • 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.

Themes[edit | edit source]

  • The title bar and watermark uses the Arial font due to a typo in the aero.msstyles and aerolite.msstyles files.
  • Only the top portion of the window frame is blurred when using the Windows Aero theme, leaving the side borders transparent.
  • The Windows Basic and the High Contrast themes do not render properly 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]