Windows 10 build 9834

Windows 10 build 9834 is a pre-Technical Preview build of Windows 10. Screenshots of this build were originally shared on 11 September 2014, and the full build was later shared online as an x64 version in the Simplified Chinese language on 8 December 2014, followed by x86 versions and other languages later on. The Windows Driver Kit and Assessment and Deployment Kit for this build, which additionally contains ARM32/ARM64 components and a Preinstallation Environment image of this build's ARM64 architecture compile (likely the only SKU that existed at that time), were uploaded onto the Internet Archive on 20 February 2023.

This build was originally released to Microsoft partners participating in the Ecosystem Engineering Access Program (EEAP), as indicated by the  branch.

Timebomb
Like other builds found in the  branch, this build uses a test-signed certificate and as a result can be installed on the current date. However, installing this build on the current date disables the ability to change the desktop wallpaper in the Control Panel.

Display drivers
Installing NVIDIA drivers on the x64 version of this build breaks DWM, resulting in a black screen. Older NVIDIA devices and drivers before 2012 are able to function correctly with DWM disabled.
 * AMD drivers do not appear to be affected by this issue.
 * A similar bug has also been discovered when installing Intel HD graphics drivers.

error during shutdown
When the system shuts down, a memory access error related to  may occur.

On-screen keyboard
On touch screen devices, on-screen keyboard pops-up only in certain programs. Restarting Windows Explorer can fix this bug.

Remote Desktop Connection
The Remote Desktop Connection client is prone to crashing at random intervals.

Incorrect window thumbnail border color
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.

Windowed Metro applications
Occasionally, the Desktop Window Manager (DWM) may fail to correctly skin the title bars of windowed Metro apps such as Settings. This results in the title bar appearing with the Windows Basic theme rather than the Aero theme. Quitting and restarting the affected application will resolve the issue.

Persistent Snap sizing
When using snapping a window to the left or right side of a user's monitor, the window will remain at the snapped size even when it is brought out of that snap.

Charms
The right-hand charms can't be brought out by bringing the mouse to the top-right or bottom-right of the screen.