Calendar falsely claims to open ics files
Calendar registers itself as a MIME handler for ics files. From its desktop file:
MimeType=text/calendar;
But nothing happens when I click on an ICS file in nautilus. It doesn't use %U in its desktop file, so there's no way it could possibly open any type of file:
Exec=gnome-calendar
So the MimeType line should be removed. It's only appropriate to use that to indicate files that the application can open.