It turns out this is possible, but it requires some GConf-Fu!
- Make sure you have the
gconf-editorpackage installed - Open the following option from the Applications menu - System: Configuration: GNOME Configuration Editor
- Navigate to
/desktop/gnome/applications/main-menu/file-area - Edit the
user_specified_appskey by double clicking on it. For example, if you want Evolution instead of F-Spot (WHY F-SPOT?!?!?!?), change thef-spot.desktopentry toevolution-2.8.desktop.
Update: Seems you can right-click on applications in the Application Browser (you get that by clicking "More Applications"
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