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Windows 11 Windows 11 Insider 26H2 Insider Preview, Experimental Channel
Windows Insider

Build 26300.8697

Build 26300.8697: Windows Insider Experimental Channel, June 2026. Dark-mode copy dialog and virtualization crash fixes

In short

The Experimental Channel is testing a more consistent dark-mode copy dialog, a 26H2 version label, and fixes for taskbar clipping and virtualization crashes.

Does it affect you? Applies to: Devices enrolled in the Windows Insider Program in the Experimental Channel.

Build
26300.8697

This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.

What changes

Improvements 4 changes

General

Gradual rollout

For: Insiders in the Experimental Channel

  • Settings > System > About and winver show version 26H2.1

File Explorer

Gradual rollout

For: Insiders in the Experimental Channel

  • The Copy dialog is more consistent and reliable in Dark mode, including when it opens and when you expand its progress view.2

Start menu

Gradual rollout

For: Insiders in the Experimental Channel

  • The Start menu more reliably reflects newly installed or removed apps without requiring a sign-out or restart.3

Settings

Gradual rollout

For: Insiders in the Experimental Channel

  • Settings > Apps > Startup is more reliable.4

Fixes 2 changes

Taskbar

Gradual rollout

For: Insiders using the new smaller taskbar option

  • The system tray might no longer get cut off or pushed off screen when you use the smaller taskbar option.5

Virtualization

Gradual rollout

For: Insiders in the Experimental Channel

  • Some devices are less likely to encounter virtualization-related crashes after installing recent builds.6
    Addresses bugchecks citing HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E).

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-06-19
Type
Windows Insider build
VersionBuildChannel
26H2 26300.8697 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (6)
  1. 1. With today’s build, Windows Insiders in the Experimental channel will see the versioning updated under Settings > System > About (and winver) to version 26H2. learn.microsoft.com
  2. 2. We’ve improved the visual consistency and reliability of the Copy dialog in Dark mode, including its launch experience and the expanded progress view. learn.microsoft.com
  3. 3. Improved reliability of Start menu reflecting newly installed or removed apps without requiring sign-out or restart. learn.microsoft.com
  4. 4. Improved reliability of Settings > Apps > Startup. learn.microsoft.com
  5. 5. Fixed an issue for Insiders using the new smaller taskbar option, where the system tray might get cut off or pushed off screen. learn.microsoft.com
  6. 6. could result in bugchecks citing HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) errors after installing the latest flights on some devices learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 6 quoted passages
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake