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Windows Insider

Build 26120.5790

Build 26120.5790: Windows Insider Beta Channel, September 2025. Fluid dictation and Studio Effects for more cameras

In short

Builds 26220.5790 (Dev) and 26120.5790 (Beta) add fluid dictation and extend Studio Effects to more cameras on Copilot+ PCs, alongside File Explorer changes and fixes.

Does it affect you? Applies to: Windows Insiders on Windows 11 version 25H2 in the Dev Channel (build 26220.5790) and version 24H2 in the Beta Channel (build 26120.5790).

Builds
26120.5790 · 26220.5790

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 5 changes

General

Gradual rollout
  • Some devices should have less lag when using File Explorer, the taskbar, or browser windows, including while watching videos.1
    Addresses an underlying issue that caused delays, including clicks taking 500ms to process.

Taskbar & System Tray

Gradual rollout

For: Insiders in the Dev and Beta Channels

  • Taskbar app preview windows stay aligned with their app icons after a display resolution change.2

File Explorer

Gradual rollout
  • The context menu no longer unexpectedly switches between its normal view and Show more options with each right-click when certain apps are installed.3

Settings

Gradual rollout

For: Insiders in the Dev and Beta Channels

  • Settings > System > Storage > Temporary files no longer gets stuck while scanning files.4

Event Viewer

Gradual rollout
  • The Microsoft Pluton Cryptographic Provider initialization error no longer appears for some Insiders after boot.5
    Addresses the Event Viewer message “The “Microsoft Pluton Cryptographic Provider” provider was not loaded because initialization failed” with error 57.

Improvements 3 changes

Agent in Settings

Gradual rollout

For: French-language Copilot+ PC users in the Dev and Beta Channels

  • The Settings agent is beginning to roll out to Copilot+ PCs whose primary display language is French.6

File Explorer

Gradual rollout

For: Insiders with a Microsoft account in the Dev and Beta Channels, outside the EEA

  • Hovering over a file in File Explorer Home shows actions such as opening its location or asking Copilot about it. The feature currently requires a Microsoft account and is not rolling out to Insiders in the EEA.7
    Work or school account (Entra ID) support is planned for a future flight.

Settings

Gradual rollout

For: Insiders in the Dev and Beta Channels

  • After updating, Advanced Settings returns to the previous For Developers experience. The change is expected to come back soon.8

New features 2 changes

Voice access

For: Copilot+ PC users in the Dev and Beta Channels

  • Fluid dictation can correct grammar, punctuation, and filler words as you speak in text apps on Copilot+ PCs. It is enabled by default and is disabled in secure fields such as passwords and PINs.9
    Available in all English locales; powered by on-device small language models.

Windows Studio Effects

Gradual rollout

For: Users of supported Copilot+ PCs in the Dev and Beta Channels

  • On supported Copilot+ PCs, you can use Windows Studio Effects with an additional camera, such as a USB webcam or a built-in rear camera.10
    The required driver update rolls out first to Intel-powered Copilot+ PCs, with AMD- and Snapdragon-powered PCs to follow in the coming weeks.

Technical details

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

Data sheet

Released
2025-09-05
Type
Windows Insider build
VersionBuildChannel
— 26120.5790 Beta Channel
— 26220.5790 Dev Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (10)
  1. 1. Fixed an underlying issue which was causing Insiders on certain devices to experience an unexpected increase in lag in various scenarios after the latest flights blogs.windows.com
  2. 2. Fixed an issue which could cause the app preview windows in the taskbar to become misaligned (away from the app icon you’d clicked / hovered over) after a display resolution change. blogs.windows.com
  3. 3. Fixed an issue where with certain apps installed, when you right clicked you may see the context menu unexpectedly switch back and forth with each right click between the normal initial view and “Show more options”. blogs.windows.com
  4. 4. Fixed an issue causing Settings > System > Storage > Temporary files to get stuck when scanning files. blogs.windows.com
  5. 5. Fixed an issue causing an event saying “The “Microsoft Pluton Cryptographic Provider” provider was not loaded because initialization failed” with error 57 to appear in Event Viewer for some Insiders after boot. blogs.windows.com
  6. 6. We are beginning to roll out the new agent in Settings experience to Windows Insiders with their primary display language is set to French. blogs.windows.com
  7. 7. For some users, the Shared section in File Explorer Home may be visible even if there is no content to display. blogs.windows.com
  8. 8. Advanced Settings will revert to the previous “For Developers” experience after updating to this build. This change will come back soon. blogs.windows.com
  9. 9. It automatically corrects grammar, punctuation, and filler words as you speak, reducing the need for manual editing. blogs.windows.com
  10. 10. On supported Copilot+ PCs, we are rolling out the ability to use Studio Effect’s AI-powered camera enhancements with an additional, alternative camera – such as a USB webcam or your laptop’s built-in rear camera. blogs.windows.com
Checked automatically: 8 of 8 checks passed, 10 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 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