Exploring the Latest Features of Windows 11 Insider Preview Build 25921: HDR Background Support and Rich Thumbnail Previews

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Windows 11 Insider Preview Build 25921 has been released to the Canary Channel. The new build introduces HDR Background , allowing users to set JXR files as their desktop background. It also offers rich thumbnail previews for cloud files on Start for users logged into Windows 11 Pro or Enterprise editions an AAD account.

Windows 11 Insider Preview Build 25921: What’s New and Important

Windows Insiders, it’s time for an upgrade! The Windows 11 Insider Preview Build 25921 is now available on the Canary Channel. This release comes with exciting new and improvements that will enhance your Windows experience.

August 2023 Bug Bash

The August 2023 bug bash is in full swing, running through Monday, August 7th at 11:59pm PDT. This event covers the latest features available in the currently available preview builds across the Canary, Dev, and Beta Channels. Be sure to check the Feedback Hub for quests!

HDR Background Support

One of the major updates in Build 25921 is the HDR Background Support. Now, you can set JXR files as your desktop background. If you have an HDR display, they will render in full HDR.

“You can now set JXR files to be your desktop background and if you have an HDR display, they will render in full HDR.”

For this feature to work, ensure your device has an HDR display or is connected to a HDR display that supports HDR. You can check this by going to Settings > System > Display and checking the HDR toggle.

Rich thumbnail previews for cloud files on Start

For those logged into Windows 11 Pro or Enterprise editions with an AAD account, a richer thumbnail preview is now available when hovering over cloud files such as Word documents under Recommended on the Start menu.

“For this initial release, richer thumbnail previews will not be available for all files and a later update will enable the experience for more files and for MSA users.”

Also, when right-clicking on cloud file recommendations, there is now an option to quickly share these files. This feature is currently available only for those logged in with an AAD account.

Final Thoughts

This new build promises to enhance your Windows experience with its new features and improvements. So, get ready to explore and make the most of these updates.

  • Windows 11 Insider Preview Build 25921 is available on the Canary Channel.
  • The build introduces HDR Background Support for JXR files as desktop backgrounds.
  • Users can check HDR support by navigating to Settings > System > Display.
  • Rich thumbnail previews for cloud files are now available on Start for users with an AAD account.
  • Richer thumbnail previews are not available for all files and will be enabled in a later update.
  • From the Windows Blog



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