Windows 11 has an x64 emulator out of the box.
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Introducing x64 emulation in preview for Windows 10 on ARM PCs to the Windows Insider Program
Updated 11/16/2021: x64 emulation for Windows is now generally available in Windows 11. For those interested in experiencing this, a PC running Windows 11 on Arm is required. Today, we're releasing the first preview of x64 emulationblogs.windows.com
So does Apple Silicon Macs, it's called Rosetta 2.