ORF images in FC12 and Karmic

I have an Olympus 500 camera and I want to be able to preview Olympus raw files (ORF extension) in Nautilus. It did not work out of the box neither in FC12 nor in Karmic. On Fedora 12 I have installed ufraw and ufraw-gimp packages.  On Karmic I have installed gimp-dcraw and gnome-raw-thumbnailer packages.  This also installs ORF support in GIMP.