Well, it's basically the same process including its reverse :-)
Power off the VM, remove the disks (without deleting them!), rename the files. You can also move the files the the VM's folder. Then re-add them to the VM, and power it on.
You'll need some scp client or log in the ESX host to do that.
And you'll also probably need to adjust the drive letters in the guest again.
Regards