https://virtio-fs.gitlab.io/howto-windows.html
Tested and working on 6.12. If this helps anyone I added the following to my go file (/boot/config/go).
Rust virtiofsd and virtiofsd.php are in /boot/virtiofsd and Simon's bash file is in /boot/virtofsd/bash
#copy virtiofsd bash wrapper
mv /usr/libexec/virtiofsd /usr/libexec/virtiofsd.old
cp /boot/virtiofsd/bash/virtiofsd /usr/libexec/virtiofsd
chmod +x /usr/libexec/virtiofsd
#copy php wrapper
cp /boot/virtiofsd/virtiofsd.php /usr/local/emhttp/plugins/dynamix.vm.manager/script