Comment 3 for bug 822605

I gave it some of my deepest thoughts ;-), and the more I think of this, the more I dislike the hardcoding - and not only because I'm a happy user of f-spot myself. :-)

There is a way to specify preferred applications: go to the system settings -> system information (I'm translating from Italian, I'm not sure if the labels are like this in English) -> preferred applications

There I can set "shotwell" as my preferred photo viewer and everything works consequently. So I believe there is no bug here.
It's undeniable that the "preferred apps" it's very hard to find, but that's an issue which should be addressed by the system settings application, IMO.

Florian, I'm closing this bug as invalid for unity-2d and to mark it as affecting the system settings (opinion).