[libvirt-users] how to use command 'guest-file-open' for Windows server 2012R2 vm

hello, I am using libvirt 1.2.17 on CentOS 7.2 - kernel 3.10.0-327.13.1.el7.x86_64. The command guest-file-open failed to open with error "this feature or command is not currently supported", the detail is as below: virsh qemu-agent-command instance-00000015 "{\"execute\":\"guest-file-open\", \"arguments\":{\"path\":\"\tmp.txt\",\"mode\":\"r\"}}" error: internal error: unable to execute QEMU agent command 'guest-file-open': this feature or command is not currently supported. The guest instance-00000015 is a Windows server 2012R2, and I installed the qemu-guest-agent by the file qemu-ga-x64.msi from virtio-win-0.1.126. It can be running in guest. Doesn't the qemu-guest-agent in Windows VM support guest-file-* commands? How or when can I use the command guest-file-* command? Thanks very much!! -mkliu28