Microsoft has released Windows 11 Insider Preview Build 25346 to Windows insiders in the Canary channel.

Announcing Windows 11 Insider Preview Build 25346

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 25346 to the Canary Channel.

What’s new in Build 25346

Content Adaptive Brightness Control (CABC) on plugged in devices including desktop PCs

This feature can be adjusted via Settings > System > Display under “Brightness & color” and through a drop-down menu with 3 options: Off, Always, and “On Battery Only”. For battery powered devices such as laptops and 2-in-1’s, the default is “On Battery Only”.  We encourage Insiders across laptops, 2-in1’s, to try the  “Always” option and give us feedback on the visual quality of CABC so we can ensure it is properly tuned.

Please note: Content Adaptive Brightness Control (CABC) needs to be enabled by the OEM (the manufacturer of the device). As a result, this feature is not available on all laptop or 2-in-1 devices.

FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Display and Graphics > Adaptive Brightness.

Changes and Improvements

[Remote Desktop]

• Redesigned the connection bar for remote desktop sessions to a new refreshed light / dark mode design that aligns with our Windows 11 design principles.

Redesigned the connection bar for remote desktop sessions.

• When sharing a local file in File Explorer to Outlook contacts – you will now see the option to quickly email the file to yourself. In addition, we’ve made improvements in loading your contacts from Outlook. This capability is not available for files stored in OneDrive folders as OneDrive has its own share experience.

[Settings]

• We are introducing new presence sensor privacy settings and APIs. If you have a device with compatible presence sensors, you can now manage your privacy and block/allow certain apps from accessing these sensors. No images or metadata is collected by Microsoft and all processing is done locally on the device hardware to maximize privacy. You will find these settings under Settings > Privacy & security > Presence sensing  here if your device supports it. App developers with devices with compatible presence sensors can target apps to request and read user presence information after requesting a human presence capability. Learn more about the API  here.

New presence sensor privacy settings under Settings if your device supports it.

[Windows Security]

• After fixing some issues based off Insider feedback, we are re-introducing the updated Windows Security (firewall) notification dialogs that match the Windows 11 visuals.

[Narrator]

• Narrator users who interact with Traditional Chinese characters are now able to do this with confidence while using Narrator and the IME candidate window in Windows. This was accomplished by creating a Traditional Chinese dictionary for detail reading. Narrator now consumes the dictionary to disambiguate each Traditional Chinese word. Users should be aware that Narrator detailed reading is only supported for the Taiwan language pack. The Hong-Kong language pack is not supported with Narrator.

[Graphics]

• It’s now easier to configure the state of HDR when running on battery! Simply go to Settings > System > Display > HDR and choose whether you want HDR (or HDR video streaming) to remain turned on when your PC is running on battery.

For developers

You can download the latest Windows Insider SDK at  aka.ms/windowsinsidersdk.

SDK NuGet packages are now also flighting at  NuGet Gallery | WindowsSDK which include:

• .NET TFM packages for use in .NET apps as described at  aka.ms/windowsinsidersdk
• C++ packages for Win32 headers and libs per architecture
• BuildTools package when you just need tools like MakeAppx.exe, MakePri.exe, and SignTool.exe

These NuGet packages provide more granular access to the SDK and better integration in CI/CD pipelines.

SDK flights are now published for both the Canary and Dev Channels, so be sure to choose the right version for your Insider Channel.

Remember to use  adaptive code when targeting new APIs to make sure your app runs on all customer machines, particularly when building against the Dev Channel SDK.  Feature detection is recommended over OS version checks, as OS version checks are unreliable and will not work as expected in all cases.

Announcing Windows 11 Insider Preview Build 25346