Windows 10 build 16170

Windows 10 build 16170 is the first Insider Preview build of Windows 10 Fall Creators Update. This build was released to Windows Insiders in the Fast Ring on 7 April 2017.

Changes

 * New Share icon in the ribbon toolbar of File Explorer.
 * Turning the schedule option for night light off in Settings now turns night light off fully.
 * Various bug fixes and improvements, which are detailed in the release announcement.

Bugs

 * Narrator doesn't work on this build.
 * Some apps and games can crash due to a misconfiguration of an advertising ID if you created an account in Creators Update build 15031. To fix this bug, open Registry Editor, navigate to  and delete the   key.
 * The restart reminder dialog doesn't pop up to see if a restart is required after downloading an update. Navigate to Settings -> Update & security -> Windows Update and check to see if a restart is required.
 * Double-clicking on the Windows Defender icon in the system tray does not open it. Right-clicking on the icon and choosing Open will bring up Windows Defender.
 * If you're using a Surface Pro 3 or Surface 3 device, you can't update to this build unless you remove the SD card.
 * Pressing F12 to open the developer tools in Microsoft Edge while it is open and focused may not return focus to the tab F12 is opened against.
 * Sometimes if you dismiss one notification in Action Center, it will unexpectedly dismiss multiple instead.