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Rust 1.91.0 promoted aarch64-pc-windows-msvc—the Windows-on-Arm64 target using the MSVC toolchain—to Tier 1. For Rust developers, that means stronger official build and test support, plus native Rust host tools on the platform. It does not guarantee that every third-party crate or application will work on every Arm64 Windows system.
What changed in Rust 1.91?
In its October 30, 2025 release announcement, the Rust Release Team said that Rust 1.91.0 promoted aarch64-pc-windows-msvc to Tier 1 support. The Rust compiler’s target documentation currently classifies it as Tier 1 with host tools and says it implements the full Rust standard library.
The target triple identifies the architecture (aarch64), Windows operating system, and MSVC toolchain. This is the MSVC target specifically; it is distinct from Rust’s GNU Windows targets.
What does Tier 1 support mean?
Rust’s platform-support policy defines Tier 1 as the project’s strongest support level. It includes official target binaries and automated builds and tests. The “with host tools” designation means Rust development tools, including rustc and Cargo, are supported as native tools on that platform.
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These are commitments from the Rust project about its own artifacts and testing. They do not certify every third-party crate, application, dependency, driver, or Windows-on-Arm64 device. Those still need to be assessed for the developer’s specific project and environment.
How to install the Windows Arm64 target
With rustup installed, add the target from a terminal:
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rustup component add aarch64-pc-windows-msvcThis installs the target’s Rust components. You will also need a compatible Windows and MSVC toolchain for the build environment; adding a target component alone does not install Visual Studio or validate your project’s external dependencies.
Windows and Visual Studio requirements
The Rust target documentation lists Windows 10 or later for client installations and Windows Server 2016 or later for server installations. It lists Visual Studio 2017 as the minimum supported version, but notes that this version is not actively tested in CI and recommends using the latest Visual Studio. Check the current target documentation against your actual Windows and toolchain versions before setting up a build.
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How the GNU Windows targets differ
Rust 1.91.0 also promoted aarch64-pc-windows-gnullvm and x86_64-pc-windows-gnullvm to Tier 2 with host tools. That was a separate change from the MSVC target’s Tier 1 promotion. The release announcement said llvm-tools and MSI installers were missing for the GNU targets at release time and would be added in future releases; consult the current platform-support documentation for their present status.
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Official sources
- Rust Release Team: Announcing Rust 1.91.0 (October 30, 2025)
- Rust Project: Platform Support
- Rustc Book:
*-pc-windows-msvc
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