This KIO slave lists files for an installed package. This makes it easy to find configuration files for a piece of software, find where space is being used or even simply to have a look at what is installed.
Once installed visiting package:/ will list all installed packages.
Visiting package:/amarok will list the files that are came from the Amarok package
The KIO depends on packagekit for its data so it should work with any Distro support packagekit.