Windows 11 Insider Preview Build 26300.7733 (KB5074178) Arrives in the Dev Channel

Microsoft has released Windows 11 Insider Preview Build 26300.7733 to the Dev Channel, giving early testers a first look at new security capabilities, system refinements, and stability fixes coming to Windows 11 version 25H2. Labeled as KB5074178, this update is especially notable for introducing native Sysmon integration, alongside meaningful improvements to File Explorer, cloud storage performance, and accessibility features.

As with all Dev Channel builds, this release is designed for experimentation and feedback, offering a glimpse into features that may shape future versions of Windows.

Native Sysmon Integration Brings Advanced Threat Monitoring to Windows 11

One of the most important additions in Build 26300.7733 is the inclusion of Sysmon as a built-in Windows feature. Previously available only as a separate Sysinternals download, Sysmon is now directly integrated into Windows 11, simplifying deployment for IT professionals, security researchers, and advanced users.

What Sysmon Does

Sysmon continuously monitors system activity and records detailed event data that can help detect:

• Suspicious process creation
• Network connections
• File modifications
• Potential malware or intrusion attempts

All collected events are written directly to the Windows Event Log, making them compatible with SIEM platforms and other security analysis tools.

How to Enable Built-In Sysmon

Sysmon is disabled by default and must be manually activated:

Option 1: Using Settings

1. Open Settings
2. Go to System
3. Select Optional features
4. Click More Windows features
5. Enable Sysmon and apply changes

Option 2: Using Command Line
Run the following command in PowerShell or Command Prompt (Administrator):

Dism /Online /Enable-Feature /FeatureName:Sysmon

Once installed, finalize the setup by running:

sysmon -i

Important: If you previously installed Sysmon using the standalone Sysinternals version, you must uninstall it before enabling the built-in feature to avoid conflicts.

File Explorer Enhancements and Cloud Storage Stability Fixes

This Dev Channel update also delivers a collection of File Explorer improvements aimed at usability and reliability.

File Explorer Fixes Include:

• Improved keyboard navigation and access key behavior
• Proper folder renaming when using custom names
• Restored missing icons and tooltips for the “Add to favorites” option

Cloud Storage Freezing Issue Resolved

Microsoft has addressed a major issue that caused apps to freeze when working with files stored on OneDrive or Dropbox. This fix is particularly impactful for users who experienced:

• File Explorer hangs
• Outlook freezing or repeatedly reloading email data
• Performance issues when PST files were stored in OneDrive

With this build, cloud-based workflows should feel noticeably smoother and more reliable.

Voice Access Expands to the Netherlands Locale

Accessibility continues to be a priority in Windows 11. With Build 26300.7733, Voice Access now supports the Netherlands (Dutch) language, allowing more users to control their PC entirely through voice commands.

This expansion improves Windows 11’s hands-free capabilities and makes the OS more inclusive for Dutch-speaking users.

Gradual Feature Rollout for Dev Channel Insiders

Microsoft is rolling out changes in this build using a phased deployment approach:

• Some features are available first to users who enable “Get the latest updates as soon as they are available” under
  Settings > Windows Update
• Other fixes and enhancements will reach all Dev Channel Insiders gradually

This controlled rollout allows Microsoft to collect real-world feedback and address issues before wider distribution.

Important Notes About Dev Channel Builds

• Features tested in the Dev Channel may never ship publicly
• Experimental functionality can change, be removed, or replaced entirely
• Some features may eventually appear in future Windows releases once they are ready

You may also notice a desktop watermark in the lower-right corner. This is normal for pre-release builds and does not indicate a system problem.

Localization Status and Feedback Options

Because many features are still under active development, full localization may not be available yet. Language support improves over time as features move closer to completion.

If you encounter translation or localization issues, report them using the Feedback Hub app.

For Sysmon-specific feedback, Microsoft encourages users to contact:
syssite@microsoft.com

To see which Windows Insider builds are available across all channels, refer to Flight Hub.

Final Thoughts

Windows 11 Insider Preview Build 26300.7733 highlights Microsoft’s focus on security, stability, and accessibility as development continues toward Windows 11 version 25H2. The introduction of native Sysmon alone makes this a significant release for power users and IT professionals, while File Explorer and cloud storage fixes improve everyday reliability.

As always, Dev Channel builds are best suited for testing environments—but they offer an exciting preview of what’s next for Windows 11.