Build 28120.3151: Windows Insider Experimental Channel, October 2026. Magnifier zoom controls and drive sanitizing during Cloud rebuild

Adds more precise Magnifier zoom controls and drive sanitizing during Cloud rebuild, alongside File Explorer improvements and fixes.

Does it affect you? Applies to: Insiders in the Experimental (26H1) Channel running this build on their PCs.

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 5 changes

Windows Magnifier

Gradual rollout 2 items

For: Insiders in the Experimental (26H1) Channel

You can type an exact zoom percentage in the Magnifier toolbar.¹
You can choose preset zoom increments from 5% to 400% in Settings.²
The Settings dropdown offers increments of 5%, 10%, 25%, 50%, 100%, 150%, 200%, and 400%.

File Explorer

Gradual rollout

For: Insiders using File Explorer

Folder view choices, such as sorting and icon size, stay consistent when you access folders through different paths and apps.³

File Explorer address bar

Gradual rollout 2 items

For: Insiders using File Explorer

The address bar accepts paths containing double backslashes and quotation marks.⁴
The suggestion dropdown closes consistently after you select an item.⁵

Fixes 2 changes

File Explorer

Gradual rollout 2 items

For: Insiders using File Explorer

Text no longer gets repeatedly selected while you rename items in folder views.⁶
Names changed only by letter case appear immediately in folder views across local and cloud storage.⁷

New features 2 changes

Cloud rebuild

Gradual rollout 2 items

Cloud rebuild can erase data on the device’s drives before reinstalling Windows. The erase is irreversible.⁸
In WinRE, choose Remove files to keep the PC or Remove & sanitize files before recycling, returning, or reassigning it. Sanitizing uses the storage hardware’s erase capability.
IT administrators can configure and start a Cloud rebuild remotely, using the installed build or a build they specify.⁹
Remote configuration and initiation use the Recovery CSP.

Technical details

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

Data sheet

Released: 2026-10-02
Type: Windows Insider build

Version	Build	Channel
—	28120.3151	Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Windows Insider release notes

Updated Oct 26, 2026

Cited passages from Microsoft's official notes (9)

1. Magnifier now gives you more control over how you zoom. You can type an exact zoom percentage directly in the Magnifier toolbar to land on precisely the level you need. learn.microsoft.com
2. We've also added preset step increments (5%, 10%, 25%, 50%, 100%, 150%, 200%, and 400%) to the Settings dropdown, so you can jump to common levels in a single click. learn.microsoft.com
3. Improved File Explorer to keep folder view customizations, such as sorting and icon size preferences, consistent across different access paths and apps. learn.microsoft.com
4. The address bar now supports paths containing double backslashes and quotation marks, for example, C:\Users\user or "C:\Users\user", improving compatibility with a wider range of inputs. learn.microsoft.com
5. Improved reliability of the address bar suggestion dropdown so it now consistently closes after an item is selected. learn.microsoft.com
6. Fixed an issue where text would be repeatedly selected while renaming items in folder views. learn.microsoft.com
7. Fixed an issue where updated names with case-only changes weren't immediately reflected in folder views across local and cloud storage. learn.microsoft.com
8. The sanitize option uses the storage hardware's erase capability to securely erase data before Windows is reinstalled and is irreversible. learn.microsoft.com
9. IT administrators can now configure and start a Cloud rebuild remotely through the Recovery CSP, using either the currently installed build or a target build you specify. learn.microsoft.com

Checked automatically: 8 of 8 checks passed, 9 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