rebhana: Don't add a type to the default.list files unless you click on the file in the browser and it shows the mime type for that file. But if it recognizes the mime type, then yes, you do have to list it in the two mime type files. And no, I don't know why the duplication.

I would actually like to "break" the mimetype recognition for MicroB, so it sends everything not listed in the defaults to dbus-switchboard. I don't know how to do that, however. At least, not yet....