gtk_file_filter_add_mime_type (both_filter, "image/x-eps");
gtk_file_filter_add_mime_type (both_filter, "application/pdf");
gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), both_filter);
gtk_file_filter_add_mime_type (both_filter, "image/x-eps");
gtk_file_filter_add_mime_type (both_filter, "application/pdf");
gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), both_filter);