Windows 11 build 25276

Build of Zinc
OS familyWindows 11 (NT 10.0)
Version number10.0
Build number25276
Build revision1000
ArchitectureAMD64, ARM64
Build labrs_prerelease
Compiled on2023-01-06
Expiration date
Timebomb2023-09-15 (+252 days)
Home (N, Single Language, China)
SE (N)
Pro (N, Single Language, China)
Pro Education (N)
Pro for Workstations (N)
Education (N)
Enterprise (Evaluation, G, GN, N, N Evaluation)
IoT Enterprise
About dialog

Windows 11 build 25276 is the seventh Insider Preview and the sixth available client build of Zinc, the 23H2 development semester of Windows as a service. It was released to Windows Insiders in the Dev Channel on 12 January 2023, along with its server counterpart.

New features and changes[edit | edit source]

File Explorer[edit | edit source]

The user interface of the Details pane has been revamped based on XAML so as to align with the design aesthetics of Windows 11. This feature can be toggled on manually by enabling the velocity ID 38613007 (FileExplorerInsights).

Task Manager[edit | edit source]

The ability to generate a live kernel dump, initially implemented in build 25188 and later available in build 25197, has been rolled out to a subset of users. This feature can be toggled on manually by enabling the 40430431 velocity ID.

Shell[edit | edit source]

  • The larger corner radius of the search box, initially introduced in build 25267, has been implemented to the search box in Start menu when not typing.
  • The Program Compatibility Assistant dialog has been updated to match the design aesthetics of Windows 11.
  • The redesigned Windows Firewall Security Alert dialog, initially implemented in build 25267, has been disabled.

Settings[edit | edit source]

The ability to show Outlook attachment data under the storage quota bar shown on the Accounts page has been rolled out to a subset of users.

Boot environment[edit | edit source]

  • bootmgfw.efi was updated to build 25262 of an unknown branch. It now includes boot environment changes from previous builds, including being built with BOOTENV_MEMORY_CHECK defined.
  • Security fixes for CVE-2023-21560 and CVE-2023-21563 have been merged into rs_prerelease, and as such, added to bootmgr (previous builds had a preliminary version of the fixes in bootmgfw, which gets built from a different unknown branch).

Miscellaneous[edit | edit source]

A banner has been added to the Microsoft Support Diagnostic Tool (MSDT), showing that the tool will be retired in 2025.[1]

Bugfixes[edit | edit source]

Taskbar[edit | edit source]

  • Fixed an issue where switching windows through taskbar previews wasn't working.
  • Fixed multiple explorer.exe crashes affecting the system tray.
  • Fixed an issue where pressing Esc key to close the flyout won't return keyboard focus to the button it was invoked from when opening it from the taskbar.
  • Fixed the layout issues with the text in the search box on the taskbar on right-to-left locales.
  • Fixed an issue where the selected search style in the taskbar settings wasn't persisting across updates.

File Explorer[edit | edit source]

Fixed an explorer.exe crash which related to loading the recent files in File Explorer.

Input[edit | edit source]

Fixed an issue where the "insert text" button wasn't working when using the Pinyin IME in double Pinyin mode.

Voice access[edit | edit source]

  • Fixed an issue where voice access wasn't working correctly for entering numbers in the Calculator app.
  • Fixed a crash when giving move left and right commands with voice access.

Widgets[edit | edit source]

Fixed an issue that was causing the Widgets board to get stuck open in an invisible state for users in certain regions, causing clicks on the left side of the screen to not work.

Bugs and quirks[edit | edit source]

General[edit | edit source]

  • Using Windows Hello to sign in with facial recognition may not work on certain ARM64 devices.
  • The system may take longer than expected to upgrade to this build in certain cases.
  • The screen may freeze when using the browser and certain apps, primarily media player apps.

Shell[edit | edit source]

  • The taskbar may sometimes be cropped in half when using the tablet-optimized taskbar.
  • On some locales, the default font used in several UI elements (such as the date and time on the taskbar) may change to regular Segoe UI instead of Segoe UI Variable.
  • The Program Compatibility Assistant does not display correctly in dark mode.

File Explorer[edit | edit source]

The following issues will only apply if the updated Details pane is enabled:

  • Enabling the updated Details pane may crash File Explorer in certain cases. Disabling dark mode may solve the issue.
  • The related files, related conversations and file activity columns are not functional, and are currently displaying placeholders.
  • The buttons are not functional.

Task Manager[edit | edit source]

  • Some dialogs may not render in the correct theme when applied from the Settings page.
  • The data content area of the Processes page may flash once when theme changes are applied in the Settings page.

Settings[edit | edit source]

Switching the Search entry point on the taskbar from the search box to the search icon via Personalization > Taskbar may fail in certain cases.

Widgets[edit | edit source]

On right-to-left locales, the content may animate out of view before the Widgets board resizes when clicking to expanded view of the Widgets board.

Safe mode[edit | edit source]

  • Enabling the search box/icon on the taskbar may cause explorer.exe to hang or crash.
  • Quick Settings and date/time clock on the taskbar may be missing due to the Capability Access Manager Service service not running.
  • Clicking Bluetooth & devices and Personalization pages may crash the Settings app due to an overrun of a stack-based buffer 0xc0000409.

Gallery[edit | edit source]

References[edit | edit source]

External links[edit | edit source]