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Windows 11 Windows 11 Insider 26H1 Insider Preview, Experimental Channel
Windows Insider

Build 28120.2760

Build 28120.2760: Windows Insider Experimental Channel, August 2026. Web-downloaded file previews and in-app purchases for elevated apps

In short

Adds previews for PDFs and non-HTML files downloaded from the web, adds in-app purchase support for some apps, and fixes an invisible mouse cursor in certain apps.

Does it affect you? Applies to: Devices enrolled in the Windows Insider Program in the Experimental (26H1) channel.

Build
28120.2760

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

New features 2 changes

File Explorer

Gradual rollout

For: Insiders in the Experimental (26H1) channel

  • The preview pane can automatically show PDFs and files other than HTML that you downloaded from the web.1
    Adds automatic preview support for PDF and non-HTML files downloaded from the web.

Microsoft Store

Gradual rollout

For: Developers of packaged WinUI 3 apps

  • Some packaged apps can offer purchases inside the app, including apps that need elevated permissions.2
    Adds support for in-app purchases in packaged WinUI 3 apps that require elevation through Microsoft's integrated commerce platform.

Fix 1 change

Input

Gradual rollout
  • The mouse cursor is visible again in certain apps.3
    Fixes an issue in recent builds that caused the mouse cursor not to be visible in certain apps.

Technical details

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

Data sheet

Released
2026-08-21
Type
Windows Insider build
VersionBuildChannel
— 28120.2760 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. PDF and non-HTML files downloaded from the web can now be previewed automatically in the preview pane. learn.microsoft.com
  2. 2. This update provides support for in-app purchases in packaged WinUI 3 apps that require elevation, helping developers offer purchases through Microsoft's integrated commerce platform. learn.microsoft.com
  3. 3. Fixed an issue in the latest builds causing the mouse cursor not to be visible in certain apps. 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 4/5, clarity 5/5, 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