Windows 8 build 7850

Windows 8 build 7850 is a Milestone 1 build of Windows 8. It was the first leaked version of Windows 8 on 2011-04-12. Initially, this build only leaked as an Enterprise SKU image. Only much later, in January 2015, additional SKUs leaked.

Being early in development, many areas still says Windows 7 and the kernel is still 6.1 (in a similar manner to XP build 2202 and build 2211). The default background image of this build is a blueish gradient with the note not to leak this version ("shhh... let's not leak our hard work").

Features
Note: Most new features must be unlocked via Registry editing.
 * Explorer Ribbon UI (Icons are all circles)
 * Centered Title Bar Text
 * Built-in PDF Reader (basic)
 * New/Modern Task Manager (partially broken)
 * Webcam Application (fullscreen)
 * AutoColorize Themes
 * ApplicationExplorer (for early start screen?)
 * AeroLite (basic)
 * Early beta of IE9
 * System Reset (sysreset.exe)
 * Portable workspace creator (pwcreator.exe)

Aero
This build appears to have slightly a slightly broken Windows Aero theme, with only the top portion of the window frame using the blur effect, leaving the side borders transparent.