Btw according to Tihiy: x64 on ARM64 is not WOW64. There's no 64-bit registry, redirection, no x64 DLLs and WOW64 API won't detect it. Instead, 64-bit binaries are hybrid containing ARM64 and x64 code.
Microsoft has finally rolled out the first Windows Insider tech preview of x64 emulation for Windows 10 on Arm devices. The update brings long-awaited support for regular 64-bit x86 applications helping to make Windows on Arm devices a more viable alternative.