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With the release of Rust 1.91, Arm is now a Tier 1 supported architecture on Windows

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aarch64-pc-windows-msvc is now a Tier 1 target with host tools for Rust, meaning ARM64 Windows with MSVC is "guaranteed to work" as a fully supported platform. This means the Rust project provides official binary releases, runs automated testing after every change to ensure builds and tests pass, and supports running development tools like rustc and cargo natively on ARM64 Windows machines. In practical terms, developers can now confidently use ARM64 Windows devices (like Windows on ARM laptops) both as compilation targets and as development platforms with the same level of support as established platforms like x86_64 Windows and ARM64 macOS.