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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.