Automatically find applications to open files based on MIME type

Presently, when a user tries to open a file in Nautilus whose type has no associated programs, no useful solutions are presented. The current "choose an installed program to open this file" dialog presents a serious usability issue, and should really be considered a last-resort fallback for geeks; most applications have properly registed file type associations so if Nautilus gets to this point in trying to open a file, we can probably give up. The average user, however, does not know this and becomes very confused when presented with, for example, "Text Editor" as an option to open a file. Unlike the proprietary competition, however, Ubuntu is different because we have a proper searchable catalogue of available applications which can be installed! Using gnome-app-install, we can have Nautilus open a search for available programs which can open a particular file type. In this way, users will be immediately presented with solutions to their problems in an intuitive, easy and unique way.