Comment 3 for bug 582214

I have .mobi files (for Amazon Kindle) and trying to open them in Nautilus just says there is no application that supports the type "Mobipocket e-book (application/x-mobipocket-ebook)".
However, fbreader does this just fine. You can directly open a book with:
"fbreader book.mobi"

I'm not sure which file needs to be updated. Would just /etc/gnome/defaults.list do the trick?
Supporting more ebook file formats out of the box would be nice :-)