Windows Server 2012 build 7788

Windows Server 2012 build 7788 is a build of Windows Server 2012. It was shared onto the BetaWiki Discord server on 24 June 2022. It is the earliest available build to include the Redpill feature locking mechanism and a confidential build warning in the watermark.

Due to its earliness, this build identifies itself as its predecessor in many areas and still bears the 6.1 kernel version, much like builds 7700 and 7850.

Redpill
This build notably features the earliest known implementation of the Redpill feature locking mechanism, which hides most features found in builds of Windows 8 (and its server counterpart). Most Redpill features that are present in this build do not possess any real functionality or do not properly function.

New features and changes

 * The Aero theme's background image has been changed to a blue gradient with a green tint at the lower right, with a message at the top advising Microsoft employees not to leak this build.
 * The Windows Classic color scheme from Windows 98 is now used as the default visual style.
 * Changed the default desktop background color again to the one used in Windows Server 2008.
 * Added the Microsoft Confidential disclaimer to the desktop and.
 * This build is the earliest known build to use a Windows Boot Application,  or , to start Hyper-V before the NT kernel.
 * The EULA has been changed to state the product name as "Microsoft Windows Server Code Name '8'" with a EULA ID of "Win8_M1"

Language profiles
The ability to manage installed language through the use of a dedicated Control Panel page has been added, although its interface is rather primitive at this point in development.

ISO mounting
This build is the first build to introduce built-in support for mounting ISO files.

Hybrid Boot
Hybrid boot has been introduced in this build, owing to the fact that it is from a core1 (including the kernel) branch.

Multimon taskbar
The taskbar is now supported on multiple monitors. The taskbar does not have a start button on monitors that are not the primary monitor but will display program icons.

Aero Lite
This is the earliest available Windows build to feature the Aero Lite visual style, which is almost identical to the Windows Aero visual style at this point in development.

Auto-Colorization
The ability to automatically change the window color based on the background has been added. It can be enabled by appending  to the end of the Aero theme's   section.

VBE 2.0 BSOD
The bugcheck screen has been updated to support the VBE 2.0 extensions. The system must crash during boot in order for the new version of the crash screen to appear.

Hyper-V Virtual PCI Bus
This is the earliest available Windows Server build to support the Hyper-V Paravirtualized PCI bus (VSP, VSC, and PCIP stub) in order to facilitate SR-IOV networking.

Bugs and quirks
This build is fairly buggy due to a lot of reverse integration happening around the time of its compile.

General

 * This build includes a non-functional XHCI driver and will not boot if USB 3.0 is enabled. Disabling USB 3.0 from the VM configuration (or through the physical machine's BIOS/EFI firmware) will allow the build to boot normally.
 * The WIM has logs and remnants indicating that when the WIM was created, the pseudolocalised language pack was installed (at 04:06:29 for index 1), then removed (at 04:21:33), then the English language pack installed (at 05:04:31).
 * A triple fault occurs during boot in VirtualBox unless paravirtualization is disabled.
 * The default user account creation UI does not work in this build. Either the   command or the Local Users or Groups MMC snap-in  must be used to create new accounts.
 * The User tile does nothing when clicked.

Redpill
When redpilled,
 * The ribbon shows all possible options at all times.
 * The Start screen will not render tiles unless you are using period-correct drivers and not the Administrator account. Nobody thus far has got it to render.
 * The Start Screen shows up as an Explorer window. It can only be closed by hitting Alt, although the start screen cannot be brought up again with the Win key.
 * The Start Screen does not have anything pinned to it by default. The user has to pin items to it manually.

Multi-monitor Taskbar

 * Only the first two monitors will show the taskbar.
 * Changing the screen resolution of the second monitor will cause the taskbar appearing as a large white line and the wallpaper will not be correctly resized. Restarting  will fix these issues.
 * The Metro Horizon will only be displayed on the main monitor, with additional monitors showing the ImmersiveBackgroundWindow fallback.
 * After an app is closed, the program's icon will still appear on the second monitor's taskbar unless a new program is dragged to the second monitor.