Windows 8 build 7850

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6.1.7850.0.winmain_win8m1.100922-1508
Build of Windows 8
6.1.7850.0.winmain_win8m1.100922-1508
OS family
Architecturex86, x64
Compiled2010-09-22
Timebomb2011-02-05 (+136 days)
Works in
About
Win8 Build7850 Winver.png
TCB.png TCBGallery.png BA.png

Windows 8 build 7850 is a build of Windows 8. This build was originally leaked as an x86 Enterprise SKU version on 12 April 2011,[1] then on 17 January 2015, an x64 version was leaked of this build along with more SKUs for both the x86 and x64 architectures.[2]

Being early in development, many areas still say Windows 7 and the kernel is still 6.1 (much like builds 7700 and 7746). The default background image of this build is a bluish gradient with a green tint at the lower right and a message at the top telling not to leak this build ("shhh... let's not leak our hard work").

Editions and keys[edit | edit source]

Edition / SKU Name Key
Starter 7Q28W-FT9PC-CMMYT-WHMY2-89M6G
Home Basic YGFVB-QTFXQ-3H233-PTWTJ-YRYRV
Home Premium RHPQ2-RMFJH-74XYM-BH4JX-XM76F
Professional HYF8J-CVRMY-CM74G-RPHKF-PW487
Enterprise H7X92-3VPBB-Q799D-Y6JJ3-86WC6
Ultimate D4F6K-QK3RD-TMVMJ-BBMRX-3MBMV

Redpill[edit | edit source]

The 2020-03-02 build of Redlock unlocks various features in this build. It's the earliest leaked build to implement Redpill.

The Start screen in this build is rather primitive, having only one view featuring every installed application with a tile. It also includes a button to bring up an early search pane. A very early and non-functional snap UI is seen when you exit from the Start screen. A primitive Charms bar is also implemented and is accessible by pressing WIN+C on your keyboard, but it is non-functional. New folder icons, along with a preview grid, are present in this build when Redpill is enabled. Other features include:

  • Support for 32-bit UEFI boot
  • Support for booting from an exFAT partition
  • 4K Native logical sector boot
  • Hybrid boot
  • Explorer Ribbon UI (icons are all circles)
  • User tile (located at the right of the taskbar)
  • Centered title bar text
  • Explorer up button
  • Built-in PDF Reader (basic)
  • Modern Task Manager (partially broken)
  • Webcam Application (full screen)
  • Built-in virtual optical drive (double-click the ISO file to directly mount the image)
  • Auto colorization of themes
  • ApplicationExplorer shell location (Applications.{4234d49b-0245-4df3-b780-3893943456e1}) - tabs include "Tile state" and "Host environment". This is where the Start screen app list is stored, even up to 8.1.
  • Aero Lite (basic)
  • Early beta of IE9
  • Built-in, working USB xHCI drivers
  • Built-in UASP drivers
  • Certificates and digital signatures that recognize the SHA256 algorithm
  • New Disk Cleanup (diskclean.exe)
  • System reset (sysreset.exe), which has a version build number of 7782
  • Portable Workspace Creator (pwcreator.exe)

Findings, fixes, enhancements[edit | edit source]

PDF Reader[edit | edit source]

There is a very early version of the Immersive Reader included, accessible by running C:\Windows\System32\glcnd.exe with any PDF file as an argument (or without any argument to open a blank page).

Modern Windows Task Manager[edit | edit source]

A preliminary version of the Modern Windows Task Manager is included as well. It is accessible by running C:\Windows\System32\TaskUI.exe.

Ribbon UI[edit | edit source]

A Ribbon version of Windows Explorer is included as well. However, most of the icons for it are placeholder circle icons.

Webcam Capture Application[edit | edit source]

An early version of the webcam capture application is included as well, accessible by running C:\Windows\System32\Webcam.exe.

Auto Colorization[edit | edit source]

Create a copy of a theme from C:\Windows\Resources\Themes, add AutoColorization=1 to the end of the [VisualStyles] section and apply.

Bugs and quirks[edit | edit source]

  • Windows Classic and the High Contrast themes are broken.
  • Changing the date appears to freeze up the Explorer shell.
  • Using Desktop Gadgets significantly slows the OS down.
  • Sometimes, upgrade in this build is broken.
  • Some setup strings don't show properly. For example, instead of "Setup is starting" or "Setup will continue after restarting your computer," "Setup is" or "Setup will continue after restarting your" strings will appear.
  • The original 2011 leak of this build is bundled with the Windows 7 RTM pre-installation environment.

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.

Gallery[edit | edit source]

External links[edit | edit source]

References[edit | edit source]