Windows 10 build 9888

10.0.9888.0.fbl_release.141113-2137
	Build of Windows 10
OS family
Architecture	x86, x64
Compiled	2014-11-13
Timebomb	2015-04-15 (+153 days)
Works in
About

Windows 10 build 9888 is a build of Windows 10, which was shared online on 2 December 2014.^[1] This is the last available build to contain the "Welcome to Tech Preview" desktop shortcut. It is also the last available build to have Windows Easy Transfer. The Mexican Spanish version of this build under the x64 architecture was uploaded to the Internet Archive on 20 February 2023,^[2] followed by its Canadian French language variant on 24 February 2023.^[3]

Editions and keys[edit | edit source]

Edition / SKU Name	Key
Core	334NH-RXG76-64THK-C7CKG-D3VPT
Professional	NKJFK-GPHP7-G8C3J-P6JXR-HQRJR
ProfessionalWMC (edition upgrade only)	GBFNG-2X3TC-8R27F-RMKYB-JK7QT

Changes[edit | edit source]

The kernel version is now 10.0 as opposed to 6.4 in previous builds. This change is so the kernel version of the operating system can match with its name.
The copyright date in winver has been updated from 2014 to 2015, despite being compiled in 2014.
Context menus are now more consistent and unified in this build.
Spacing of system tray icons has been decreased.

Findings[edit | edit source]

Hidden features[edit | edit source]

The following hidden features have been found within this build:

Hidden lock screen - enabled by setting Threshold to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\TestHooks] in the registry like in build 9845. It is quite buggy and it will auto login if there is no password set.
Enable XAML Start menu - create and set UseExperience to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ImmersiveShell\Launcher]
Search box on the taskbar - enabled by setting EnableSearchBox to 1 under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Search

Hidden apps[edit | edit source]

There are a few hidden apps in this build:

Windows Default Lock Screen - accessed by running C:\Windows\explorer.exe shell:AppsFolder\Microsoft.WindowsDefaultLockScreen_8wekyb3d8bbwe!LockApp
Cloud Experience Host - accessed by running C:\Windows\explorer.exe shell:AppsFolder\Microsoft.CloudExperienceHost_8wekyb3d8bbwe!App
Windows Shell Experience Host - accessed by running start-menu://test/

Bugs[edit | edit source]

Window thumbnail border color error[edit | edit source]

If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel.