Windows 10 build 9900

Build of Windows 10
OS family
Architecturex86, x64
Timebomb2015-04-15 (+135 days)
Works in
TCB.png TCBGallery.png

Windows 10 build 9900 is a build of Windows 10, which was uploaded to BetaArchive on 29 January 2015.[1] It is the earliest available build of Windows 10 to be compiled in the fbl_awesome1501 branch.

Editions and keys[edit | edit source]

Edition / SKU Name Key
ProfessionalWMC (edition upgrade only) GBFNG-2X3TC-8R27F-RMKYB-JK7QT
Enterprise PBHCJ-Q2NYD-2PX34-T2TD6-233PK

New features and changes[edit | edit source]

Taskbar[edit | edit source]

  • The taskbar design has been changed to a flatter style and now uses a dark opaque color scheme.
  • Search has been improved with the addition of a text box.
  • The Security and Maintenance flyout has been removed.

Cortana[edit | edit source]

This is the first available build to include Cortana, which was a feature brought over from Windows Phone. It can be accessed from taskbar search.

Settings[edit | edit source]

  • Settings has an updated homepage, which resembles the Category View in Control Panel.
  • Background settings have been added to personalization.
  • An option to change feedback frequency has been added.
  • Speech now has an option to change your spoken language.
  • The Storage Sense and Windowing pages have been added.
  • Buttons for full-screen dialogs (ex: Refresh your PC) have been made wider.

Windows Update[edit | edit source]

Windows Update has been removed from Control Panel. However, it can be restored by modifying registry keys.

Miscellaneous[edit | edit source]

  • The privacy page during the OOBE has been updated.
  • New desktop wallpapers and themes are included.
  • The window design of Metro applications has changed to a more modern style.

Removed features[edit | edit source]

This build removes the following apps and features:

  • Calculator (Win32)
  • Windows Easy Transfer
  • Settings` section on the Charms bar
  • "Welcome to Tech Preview" desktop shortcut

Findings[edit | edit source]

Hidden features[edit | edit source]

The following hidden features have been found within this build:

  • New tray clock user interface - enabled by creating key 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]
  • New volume flyout - enable by setting EnableMtcUvc to 1 under [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\MTCUVC]

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
  • Print Dialog - accessed by running C:\Windows\explorer.exe shell:AppsFolder\Windows.PrintDialog_cw5n1h2txyewy!Microsoft.Windows.PrintDialog
  • Windows Shell Experience Host - accessed by running start-menu://test/

Bugs[edit | edit source]

BIOS support[edit | edit source]

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

Incorrect 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.

Gallery[edit | edit source]

References[edit | edit source]