Build 19045.5674: Windows Insider Release Preview Channel, March 2025. Noto CJK fonts and a File Explorer thumbnail crash fix

Adds Noto fonts and updates Windows Search for Insiders running Windows 10, version 22H2, in the Release Preview Channel. It also fixes thumbnail, Remote Desktop, and printer issues.

Does it affect you? Applies to: Insiders running Windows 10, version 22H2, in the Release Preview Channel.

Microsoft publishes separate notes for this KB for Windows 10.

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 3 changes

Thumbnails

For: Windows 10, version 22H2 Insiders

File Explorer thumbnails no longer cause crashes that leave white pages instead of the actual thumbnails.¹

Remote Desktop

For: Windows 10, version 22H2 Insiders using Remote Desktop

Certain Get-Help troubleshooters can run in a Remote Desktop session.²

Printers

Printers using certain drivers no longer unexpectedly print incorrect or unwanted text.³
The fix applies to printers using Independent Hardware Vendor (IHV) drivers.

Improvements 2 changes

Mobile Operator Profiles

For: Windows 10, version 22H2 Insiders

Country and mobile operator profiles are updated.⁴
Updates Country and Operator Settings Asset (COSA) profiles.

Web Search Providers

For: Windows 10, version 22H2 Insiders in the EEA

Windows Search improves support and discoverability for web search providers in the European Economic Area.⁵

New features 2 changes

Noto Fonts

For: Windows 10, version 22H2 Insiders

Windows adds fonts for Chinese, Japanese, and Korean text.⁶
Adds Noto CJK fonts.

Temporary files

For: Windows 10, version 22H2 devices running system processes

System processes can store temporary files in a secure directory, reducing the risk of unauthorized access.⁷
System processes can use C:\Windows\SystemTemp by calling the GetTempPath2 API or using .NET's GetTempPath API.

Technical details

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

Data sheet

Released: 2025-03-13
Type: Windows Insider build

Version	Build	Channel
—	19045.5674	Release Preview Channel

Security

No vulnerabilities are listed for this update.

Sources

Windows Insider Blog

Updated Oct 27, 2026

Cited passages from Microsoft's official notes (7)

1. Fixed: Thumbnails in File Explorer may crash resulting in white pages appearing instead of the actual thumbnail. blogs.windows.com
2. Fixed: Certain Get-Help troubleshooters might not run in a Remote Desktop session. blogs.windows.com
3. Fixed: Printers using Independent Hardware Vendor (IHV) drivers might unexpectedly output incorrect or unwanted text. blogs.windows.com
4. Updated: Country and Operator Settings Asset (COSA) profiles are updated. blogs.windows.com
5. This update introduces improved support in Windows Search for the European Economic Area (EEA), including increased discoverability. blogs.windows.com
6. This update provides Noto CJK (Chinese, Japanese, and Korean) fonts in Windows. blogs.windows.com
7. This update enables system processes to store temporary files in a secure directory “C:\Windows\SystemTemp” via either calling GetTempPath2 API or using .NET’s GetTempPath API, thereby reducing the risk of unauthorized access. blogs.windows.com

Checked automatically: 8 of 8 checks passed, 7 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 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