Comment 8 for bug 296585

Ha? Still broken on a fresh install of Karmic [amd64], fully updated.
Archive mounter runs:
    /usr/lib/gvfs/gvfsd-archive file=%s
This creates the mount, but doesn't open it in nautilus.

Nautilus does know that a new mount was created - it shows it in the sidebar.
One (correct?) fix would be for nautilus to automatically open a new window for the mount, as it does for inserted media.

A simpler fix would be for "Archive Mounter" (/usr/share/applications/mount-archive.desktop) to run:
    nautilus archive://<URL encoding of "file://<file>">
(probably needs a wrapper script to achive the correct encoding). This triggers the mount automatically, and displays it in a new nautilus window. [tested on .zip and .iso files]