Windows ARM64 Support

This page covers how to build and deploy game targets to Windows on ARM64 hardware.

This covers two ARM64 variants:

• ARM64: Native ARM64 code. Produces the most efficient binaries for ARM64 hardware and is the recommended choice for dedicated ARM64 game builds.

• ARM64EC (Emulation Compatible): ARM64 code that can interoperate with x64 DLLs in the same process. Useful when your project depends on third-party plugins or middleware that only ships x64 binaries. ARM64EC binaries carry a small overhead compared to pure ARM64 due to x64 interop support.

You can also produce a combined arm64+x64 build, which packages two side-by-side executables. The UE bootstrapper launches the correct one based on the machine's architecture.

Prerequisites

• A Windows on ARM64 development or test PC

• Visual Studio 2022 with the ARM64 build tools component installed (available in the Visual Studio Installer under Individual Components)

Building via the Editor

Select Platforms > Package Project > Windows from the main editor toolbar, then select the target architecture:

• x64

• arm64

• arm64ec

Then select Platforms > Package Project to start packaging.

The Project Launcher (accessible via Platforms > Project Launcher) supports creating and saving custom launch profiles for ARM64 builds.

Combined builds (arm64+x64, x64+arm64ec) require the command line.

Building via RunUAT BuildCookRun

Single-Architecture Builds

To build for arm64, add the -clientarchitecture parameter to BuildCookRun:

-clientarchitecture=arm64

or

-clientarchitecture=arm64ec

Combined Architecture Builds

Combined builds package two side-by-side executables; the UE bootstrapper selects the correct one at launch. Use -clientarchitecture=arm64+x64 to produce a build that includes both a native ARM64 executable and an x64 executable:

Engine\Build\BatchFiles\RunUAT.bat BuildCookRun
  -project=MyGame\MyGame.uproject
  -platform=Win64
  -clientarchitecture=arm64+x64
  -build -cook -stage -pak

Use -clientarchitecture=x64+arm64ec to combine x64 with ARM64EC instead.

Windows ARM64 PC GDK Support

ARM64 game targets are supported with the Microsoft GDK Plug-ins when using the April 2026 GDK or later. Install the April 2026 GDK, then build with -platform=Win64 -clientarchitecture=arm64 as described above. No additional project configuration is required.

Known Limitations

• ARM64 Editor: The native ARM64 and ARM64EC editor builds are not supported. While it is possible to run the x64 editor on ARM64, the recommended workflow is to develop on an x64 PC and deploy game builds to ARM64 hardware for testing.

• Clang: Clang is not supported for Windows ARM64 and ARM64EC targets. Use MSVC to build these targets.