(defcstruct gtk-file-filter
  (contains gtk-file-filter-flags)
  (filename :string)
  (uri :string)
  (display-name :string)
  (mime-type :string))  

contains

Flags indicating which of the following fields need are filled.

filename

The filename of the file being tested.

uri

The URI for the file being tested.

display-name

The string that will be used to display the file in the file chooser.

mime-type

The MIME type of the file.