MIME-type handling in GNOME
I'm unhappy with the choice of application made by Opera's M2 email client when opening PDF attachments to my mail -- I was told Opera falls back on the systems default application based on its MIME type.
This is on a Debian Etch system running GNOME 2.14.3, and I don't quite understand where MIME types and default apps are specified. I know I can right-click on a specific document, bring up the properties dialog and pick a default app on the "Open With" tab. After this, GNOME will use a different default, but Opera doesn't seem to know about it.
Are there other places to control GNOME's default apps?