KB5074170 Update Lands in Windows 11 Dev Channel With File Explorer Fixes

Microsoft has pushed KB5074170 to the Dev Channel, raising the Windows 11 build number to 26300.7674. The update is effectively identical to KB5074169 released to the Beta Channel, with the same fixes and known issues included.

Starting with this release, the Dev Channel is moving ahead to 26300 series builds. Once build 26300.7674 is installed, Insiders can no longer switch from the Dev Channel to the Beta Channel. Microsoft has issued advance warnings about this change, which follows its standard Insider Program process.

KB5074170 brings various fixes to the Dev Channel

Gradual fixes

File Explorer

• Fixed an issue where the Extract All option did not appear in the command bar when browsing non-ZIP archive folders.

Start menu

• Fixed an issue where clicking hide this pane in the mobile device side panel did not lead to the setting to hide it for some Insiders.

Search

• Fixed a bug where the Search process displayed an X icon instead of the magnifying glass.

Settings

• Made underlying changes to improve cases where the Settings Home page loaded very slowly.

Display & Graphics

• Fixed an issue causing secondary monitors to show black screens or not display correctly after recent updates for a small number of Insiders.

Other

• Fixed an underlying issue that could cause unexpected sign-in failures with Azure Virtual Desktop and Windows 365.
• Fixed an issue causing some Insiders to encounter a SYSTEM_SERVICE_EXCEPTION bug check after recent flights.

Known issues

Start menu

• Clicking show more apps in Categories view may not work correctly.

File Explorer

• Open File Explorer windows and tabs may unexpectedly jump to Desktop or Home.

Xbox full screen experience for PC

• Some apps may behave unexpectedly, especially those that expect a fixed window size or launch additional windows.

Taskbar & System Tray

• Some apps may not appear in the system tray when they should.

Click to Do

• The Microsoft 365 Copilot prompt box on selected images may not function if the Microsoft 365 Copilot app is not running.

In related news, Microsoft has also released Preview Update KB5074105, which improves Smart App Control and fixes multiple issues, including Start Menu problems and black screen bugs.