Windows 81 Qcow2 Install 〈Windows〉
Then use qm importdisk to import it into Proxmox.
qemu-img create -f qcow2 /var/lib/libvirt/images/win8.1.qcow2 60G windows 81 qcow2 install
qemu-img create -f qcow2 win81.qcow2 60G Then use qm importdisk to import it into Proxmox