Windows for ARM can already run 32-bit x86 executables. They’re working to bring similar support for 64-bit software.
I was under the impression (like many others apparently) that Windows 10 ARM64 wouldn't be very useful (since so few native apps are available), but being able to run 32-bit (x86) apps is huge:
Running 32-bit Applications https://docs.microsoft.com/en-us/windows/win32/winprog64/run...