Windows 11 build 25905 out on the Canary Channel

Microsoft released a new preview of Windows 11 (build 25905) on the Canary Channel. This flight introduces Rust in the kernel, removes ARM32 support, and adds a new authentication policy. An update is also delivered with various changes and improvements.

Microsoft released Windows 11 build 25905 for computers enrolled in the Windows Insider Program Canary Channel, and included several new changes and improvements.

Build 25905 for Windows 11, according official changeincluded with an early implementation of important kernel features in secure Rust, removed support for ARM32 Universal Windows Platform (UWP) applications, and included a new Post Authentication Actions policy.

Additionally, build 25905 introduces a new version of the color format for richer emoji with a 3D-like appearance, and the Microsoft Store is also updated with a new section promoting AI apps.

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Windows 11 build 25905

Here are all the new features and improvements for the latest release of Windows 11 on the Canary Channel:

Rust for Windows Kernels

As seen earlier, starting with build 25905, Windows 11 introduced an early implementation of Rust for important kernel features. Rust is an open source programming language designed primarily for building operating systems, but also for building applications. This language is very popular among programmers because it offers syntax and performance similar to C++ and provides greater memory safety without garbage collection.

In this first preview, the company added Rust to a small number of features, including “win32kbase_rs.sys” which contains a new implementation of the GDI region.

ARM32 application support

Microsoft also removed support for ARM32 UWP apps from ARM based devices, after this update, ARM32 apps will no longer launch on your computer. (ARM64 apps are not affected by this change.)

If you are still using the ARM32 app, you will need to manually uninstall it and then reinstall it from the Microsoft Store.

Install Authentication Actions

As part of the new Windows Local Administrator Password Solution feature, this flight also updated the policy “PostAuthenticationActions” to include option called “Reset password, exit the managed account, and terminate all remaining processes” to stop a specific individual process launched in an OTS (over-the-shoulder) upgrade scenario, for example, using “runas.exe.”

New font color emoji

The development team also rolled out a new color font format to COLRv1 to display a richer emoji with a 3D-like appearance.

New font color emoji/Image: Microsoft

New Microsoft Store AI hub

Finally, the Microsoft Store app is getting an update featuring a new AI Hub that promotes the best AI experiences built by the developer community and Microsoft.

As part of a known issue, this build will not be offered to ASUS devices or PCs with ASUS motherboards, and Ethernet connected devices may lose network connectivity after updating to this build.

Installing builds

To download and install Windows 11 build 25905, you must register your device at Canary Channel via “Windows Insider Program” settings from “Update & Security” section. Once you have registered your computer in the program, you can download the build from the “Windows Update” settings by clicking a button “Check for updates”.

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