proton-runproton-run is a recently released package that allows you to use Steam's Proton Experimental to run x86_64 Windows applications under BredOS ARM64.
proton-run (yay -S proton-run).Simply open a terminal and 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.