Exo 0.10 (Xfce 4.10) roadmap
Remove hard-coded applications for preferred applications
Right now the preferred application helper installs a set of 'known' applications so certain categories. This works fine-ish, but if the user for example uses a web browser that is not in this set, he/she needs to manually set it. Instead it should look for installed desktop files that provides a special mimetype or category.