Windows 10 build 9906

Windows 10 build 9906 is a build of Windows 10, which was shared online on 29 January 2015. It is very similar to build 9903, and as such, does not feature many changes other than bug fixes.

Hidden features
The following hidden features have been found within this build:


 * New tray clock user interface - enabled by creating key  under
 * Hidden lock screen - enabled by setting  to 1 under
 * Return to the old Start menu - set  to 0 under
 * New volume flyout - enable by setting  to 1 under

Hidden apps
There are a few hidden apps in this build:


 * Windows Default Lock Screen - accessed by running
 * Cloud Experience Host - accessed by running
 * Print Dialog - accessed by running
 * Windows Shell Experience Host - accessed by running

UEFI BIOS
This build can only be installed on machines utilizing UEFI firmware since it hangs on a BIOS system.

Window thumbnail border color error
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.