Windows 11 build 25126

Build of Copper
OS familyWindows 11 (NT 10.0)
Version number10.0
Build number25126
Build revision1000
ArchitectureAMD64, ARM64
Build labrs_prerelease
Compiled on2022-05-21
Expiration date
Timebomb2022-09-15 (+117 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
TCB.png TCBGallery.png

Windows 11 build 25126 is the ninth Insider Preview and the third available client build of Copper, the 23H1 development semester of Windows as a service. It was released to Windows Insiders in the Dev Channel on 25 May 2022.

Components from the AMD64 version of this build were discovered on the Microsoft Symbol Server two days prior to this build being released.

New features and changes[edit | edit source]

Settings[edit | edit source]

The ability to view details about all supported and licensed Microsoft Office products under the Accounts page has been added. This feature is only available to a subset of users.

Miscellaneous[edit | edit source]

  • The Lock option in the Start menu in Windows Sandbox has been removed.
  • The Local Administrator Password Solution (LAPS) policy settings has been integrated into Group Policy, located at Configuration > Administrative Templates > System > LAPS.

Windows Preinstallation Environment[edit | edit source]

Task Manager now displays CPU information.

Bugfixes[edit | edit source]

General[edit | edit source]

  • Fixed an issue that was causing the DRIVER_IRQL_NOT_LESS_OR_EQUAL bugcheck in pci.sys when attempting to upgrade.
  • Fixed an issue that was causing the Program Compatibility Assistant Service to use an unexpectedly large amount of CPU for some users after upgrading.
  • Fixed a high hitting explorer.exe crash that could happen when using Search.
  • Fixed an issue where using "Open All Active Printers" from the printer icon in the system tray would unexpectedly open File Explorer when there were no active queues.

Shell[edit | edit source]

Fixed an issue that was causing the docked touch keyboard to unexpectedly dismiss when trying to edit the name of a folder in Start menu.

Settings[edit | edit source]

Fixed an issue that was causing the preview image under Personalization > Lock Screen page to be backwards when using an Arabic or Hebrew display language.

Task Manager[edit | edit source]

  • Fixed an issue that was causing Task Manager to hang when explorer.exe keeps hanging.
  • Fixed an issue where the context menus weren't following the same mode (light or dark) as Task Manager itself for some users.
  • Fixed a typo in the "Minimize on use" tooltip.
  • Fixed an issue where if the graphs on the side of the Performance page is hidden, the color of the circles used wouldn't now match the graph in the summary view.
  • Addressed an issue where the "Not Responding" status for certain apps wasn't being reflected on the Processes page.

Bugs and quirks[edit | edit source]

General[edit | edit source]

Some games that use Easy Anti-Cheat may crash or cause the device to bugcheck.

Live captions[edit | edit source]

  • Certain apps in full screen (e.g., video players) may prevent live captions from being visible.
  • Certain apps positioned near the top of the screen and closed before live captions is run may re-launch behind the live captions window positioned at top.

Safe mode[edit | edit source]

  • 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]

External links[edit | edit source]