The tool proton-run is a recently released package that allows you to use Steam's Proton Experimental to run x86_64 Windows applications under BredOS ARM64.
Open Steam and navigate to your Library. Click into the searchbar and type proton. Choose Proton Experimental and install it.
Other versions of proton will not work.
proton-run with the commandyay -S proton-run
proton-run /path/to/your/windows/program.exe
Not a lot of apps will work. There are three emulators chainloaded to make this possible.
But it's the state of x86 emulation.