From Fedora Project Wiki
http://people.redhat.com/~rjones/guestfs-browser/
The guest filesystem browser lets you browse into the filesystem and Windows Registry of guests.
To run it, just do:
# guestfs-browser
Then select Connect → Connect to local KVM hypervisor.
Choose the guest from the Guest: list in the toolbar.
For Windows guests you can also see into the Windows Registry.
Note that guestfs-browser is currently read-only.