Windows 10 build 9908

10.0.9908.0.winmain_prs.141212-1625
	Build of Windows 10
OS family	Windows NT
Version number	10.0
Build number	9908
Build revision	0
Architecture	x64
Build lab	winmain_prs
Compiled on	2014-12-12
Expiration date
Timebomb	2015-04-15 (+124 days)
About dialog

Windows 10 build 9908 is a build of Windows 10, which was uploaded on 1 April 2022. It is the last build to have the option to use the Start screen by default, as later builds would hide the option for it and eventually disable its code completely. The Start screen's functionality would be completely removed in the later stages of the development phase of Windows 10 November Update.

Prior to its upload, two screenshots of this build were privately shared in April 2021. This would be later followed by the publication of three screenshots of this build featuring a questionable crudely-edited wallpaper, of which were shared onto the BetaWiki Discord server on 7 September 2021, followed by several more on 22 December 2021.

Editions and product keys[edit | edit source]

Edition / SKU Name	Product key
Core	334NH-RXG76-64THK-C7CKG-D3VPT
Pro	NKJFK-GPHP7-G8C3J-P6JXR-HQRJR
Pro with Media Center (edition upgrade only)	GBFNG-2X3TC-8R27F-RMKYB-JK7QT
Enterprise (edition upgrade only)	PBHCJ-Q2NYD-2PX34-T2TD6-233PK

Findings[edit | edit source]

Hidden features[edit | edit source]

New Action Center (can be opened with ⊞ Win+A) - enabled by creating and setting UseActionCenterExperience to 1 under [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell]
New tray clock user interface - enabled by creating value UseWin32TrayClockExperience under [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell]
Hidden lock screen - enabled by setting Threshold to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\TestHooks]
Enable XAML Start menu - create and set UseExperience to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ImmersiveShell\Launcher]
New volume flyout - enable by setting EnableMtcUvc to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\MTCUVC]

Bugs[edit | edit source]

BIOS support[edit | edit source]

This build will only work on real hardware utilizing BIOS, unlike VMware which gives a CPU fault. On VMware, the user will need to use UEFI firmware.

Window thumbnail border color[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 or restarting Windows.