Index: gtk2_ardour/sfdb_ui.cc
===================================================================
--- gtk2_ardour/sfdb_ui.cc	(revision 11760)
+++ gtk2_ardour/sfdb_ui.cc	(working copy)
@@ -449,6 +449,7 @@
 		midi_filter.add_custom (FILE_FILTER_FILENAME, sigc::mem_fun(*this, &SoundFileBrowser::on_midi_filter));
 		midi_filter.set_name (_("MIDI files"));
 
+		matchall_filter.add_custom (FILE_FILTER_FILENAME, sigc::mem_fun(*this, &SoundFileBrowser::on_midi_filter));
 		matchall_filter.add_pattern ("*.*");
 		matchall_filter.set_name (_("All files"));