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Key Points
- Microsoft released Windows 11 Insider Preview Build 26300.7939 to the Dev Channel, focusing on security, productivity, and accessibility improvements.
- New features are gradually rolling out to testers who opt in via the Settings > Windows Update menu, including enhanced audio sharing controls and improved Narrator functionality.
- Updates include better reliability for storage management, taskbar behavior in Safe Mode, and typing on ADLaM keyboards.
Microsoft has launched Windows 11 Insider Preview Build 26300.7939 for users in the Dev Channel, packing new security tools, performance enhancements, and accessibility upgrades. The update is part of the company’s ongoing testing and feedback approach, with most changes being sent first to Insiders who enable the "Get the latest updates as they are available" toggle in Settings.
One major addition targets administrators and security professionals. A new registry setting, LockBatchFilesWhenInUse (DWORD value 0 or 1), lets Microsoft’s Command Processor lock batch files during execution. That change aims to stop tampering mid-run and reduces the number of signature validations needed, boosting both security and performance. Policy creators can also achieve the same effect through a manifest control.
Microsoft is also bringing extra user control to Shared Audio (preview) for Bluetooth LE Audio devices. With this update, listeners can now use separate sliders to adjust their volume independently while sharing audio, without affecting the other person. A new taskbar indicator reminds users that sharing is active.
The feature list now includes broader device support from audio hardware makers, with Samsung Galaxy Buds 4 and 4 Pro, Sony WF‑1000XM6 earbuds, and Xbox Wireless Headsets all offering shared audio compatibility.
Accessibility improvements include a new Narrator command: Narrator key + "\" can now read the contents of a status bar in Office apps, such as document statistics in Word or summary calculations in Excel cells.
Reliability updates address several areas. Microsoft paused the rollout of new taskbar animations with auto-hide enabled, and made taskbar component loading more stable in Safe Mode. The system now handles removal of Windows Update backup files more reliably, and typing with the ADLaM keyboard is more stable.
Microsoft notes that many features are deployed via Controlled Feature Rollout and may never ship publicly. They encourage Insiders to provide feedback, especially on localization, as features evolve. A complete list of builds per Insider channel is available in Microsoft’s Flight Hub.
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