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e3ace39
(Get the code!)
It is reproducible. You can test this, for example, by removing the extension from a media file, and observing that it is still recognised as a media file in Nautilus because of its magic number data. Then open a media player, e.g. SMPlayer or Totem, and use the "Open..." facility. Note how the file is not listed because it doesn't match the extension glob.
As you can see, the Gnome file open dialogs use their own globbing and do not tap into the shared-mime-info database.
I'm using Lucid and the issue is that Gnome does not list files of a certain type using XML namespacing, magic numbers or the globs in the MIME database, but rather through a separate globbing mechanism.