Several people managing Windows virtual machines have told me that libguestfs/virt-cat isn’t enough for them. They’d like to be able to get at Windows Registry entries in the guest.
A typical example is the imaginary [as of now] virt-win-reg command that lets you interrogate the Registry in a guest:
$ virt-win-reg MyWinGuest ‘\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion’
“ProductName”=”Microsoft Windows Server [...]