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Windows Insider

Build 28120.3032

Build 28120.3032: Windows Insider Experimental Channel, September 2026. Cloud rebuild and a fix for Linux shared folders

In short

Adds Cloud rebuild for reinstalling Windows from Recovery and fixes Plan9 folder sharing with Linux VMs. It also resolves an Easy Anti-Cheat launch issue.

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

Build
28120.3032

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

Fixes 2 changes

Hyper-V

Gradual rollout
  • Folders shared from a Windows host using Plan9 appear and can be accessed in affected Linux virtual machines again.1
    Fixes an issue affecting some applications that use HCS-managed virtual machines when sharing host folders with Linux VMs using Plan9.

Easy Anti-Cheat

For: Users of Easy Anti-Cheat

  • The Easy Anti-Cheat launch issue described in the notes is marked as resolved.2
    The notes identify the error as 0xc000007b: "The application was unable to start correctly."

New feature 1 change

Windows Recovery

Gradual rollout

For: Insiders in the Experimental Channel

  • Cloud rebuild reinstalls Windows to a clean state and downloads the Windows image and device drivers from Windows Update. It can run even when Windows won't boot, without USB media or a custom image.3
    Start it in WinRE at Troubleshoot > Recovery and uninstall > Cloud rebuild. A wired Ethernet or Wi-Fi connection is required; review the target build, edition, and language, then confirm the data-loss warning.

Technical details

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

Data sheet

Released
2026-09-18
Type
Windows Insider build
VersionBuildChannel
— 28120.3032 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. Fixed an issue where some applications that used HCS-managed virtual machines experienced issues when sharing host folders with Linux VMs using Plan9. learn.microsoft.com
  2. 2. [Issue resolved] We are aware Easy Anti-Cheat (EAC) might fail to launch and display the error, "The application was unable to start correctly (0xc000007b)." learn.microsoft.com
  3. 3. Unlike Reset this PC, Cloud rebuild downloads both the target Windows image and the device's drivers from Windows Update, so the device comes back fully functional without USB media, without a custom image, and without depending on the health of the currently installed OS. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 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 5/5, clarity 4/5, completeness 5/5. 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