KB5074170 Windows 11 Insider Dev build 26300.7674 (25H2)

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 26300.7674 (KB5074170) to the Dev Channel.

Starting today, the Dev Channel is jumping ahead to receive 26300 series builds. This means that the window to switch from the Dev Channel to the Beta Channel is closed once Build 26300.7674 is installed. If you are in the Dev Channel today and still want to switch to the Beta Channel at the last minute, when Build 26300.7674 is offered you can pause updates in Windows Update and switch your channel to the Beta Channel and un-pause updates.

These 26300 series builds will contain many of the same features and improvements as the 26220 series builds that will continue to be released in the Beta Channel. Over time, we will be making behind-the-scenes platform changes in each build so they may have different known issues because of those changes.

In the case of Build 26300.7674 today – this build contains the same features and improvements as Build 26220.7653 released previously.

As always, if you experience any issues while you use your PC on the builds we release to the Dev Channel, please file feedback in Feedback Hub.

Changes in Dev Channel builds and updates are documented in two buckets: new features, improvements, and fixes that are being gradually rolled out for Insiders who have turned on the toggle to get the latest updates as they are available (via Settings > Windows Update*) and then new features, improvements, and fixes rolling out to everyone in the Dev Channel. For more information, see the Reminders section at the bottom of this blog.

Fixes gradually being rolled out with toggle on*

[File Explorer]

Fixed an issue where the “Extract All” option would not appear in the command bar while browsing non-ZIP archive folders.

Fixed an issue for some Insiders where clicking the “hide this pane” button in the mobile device side panel might not lead to the setting to hide it.

[Search]

Fixed an issue where the Search process was showing an icon with an X instead of a magnifying glass.

[Settings]

We’ve made some underlying changes to help address cases where the Settings Home page might be very slow to load.

[Display & Graphics]

Fixed an issue causing secondary monitors to not display correctly and show black screens after the latest updates for a small number of Insiders.

[Other]

Fixed an underlying issue in the previous flight which could cause unexpected sign-in failures when using Azure Virtual Desktop and Windows 365.
Fixed an issue causing some Insiders to see a bug check with error SYSTEM_SERVICE_EXCEPTION after the last few flights.

Known issues

[NEW] We’re working on the fix for an issue where when using the Start menu in Categories view, clicking the entry to show more apps in the category might not work.

[File Explorer]

[NEW] We’re working on the fix for an underlying issue causing all open File Explorer windows and tabs to unexpectedly jump to Desktop or Home sometimes.

[Xbox full screen experience for PC]

Some apps may behave unexpectedly when using FSE, particularly those that expect to be locked to a given size or launch additional windows.

[Taskbar & System Tray]

We’re working on the fix for an issue where for some Insiders apps aren’t showing in the system tray when they should be.

[Click to Do]

We’re working on the fix for an issue where the Microsoft 365 Copilot prompt box on selected images does not function if the Microsoft 365 Copilot app is not running.

Reminders for Windows Insiders in the Dev Channel

Updates are based on Windows 11, version 25H2 via an enablement package (Build 26300.7674).
Many features are rolled out using Controlled Feature Rollout technology, starting with a subset of Insiders and ramping up over time as we monitor feedback to see how they land before pushing them out to everyone in this channel.
The desktop watermark shown at the lower right corner of the desktop is normal for Windows Insider pre-release builds.
For Windows Insiders who want to be the first to get features gradually rolled out to you, you can turn ON the toggle to get the latest updates as they are available via Settings > Windows Update*. Over time, we will increase the rollouts of features to everyone with the toggle turned on. Should you keep this toggle off, new features will gradually be rolled out to your PC over time once they are ready.
Features and experiences included in these builds may never get released as we try out different concepts and get feedback. Features may change over time, be removed, or replaced and never get released beyond Windows Insiders. Some of these features and experiences could show up in future Windows releases when they’re ready.
Some features in active development we preview with Windows Insiders may not be fully localized and localization will happen over time as features are finalized. As you see issues with localization in your language, please report those issues to us via Feedback Hub.
Check out Flight Hub for a complete look at what build is in which Insider channel.