@@ -725,7 +725,7 @@ class DotWindow(Gtk.Window):

     def on_open(self, action):

         chooser = Gtk.FileChooserDialog(parent=self,

-                                        title="Open dot File",

+                                        title="Open Graphviz File",

                                         action=Gtk.FileChooserAction.OPEN,

                                         buttons=(Gtk.STOCK_CANCEL,

                                                  Gtk.ResponseType.CANCEL,

@@ -734,7 +734,8 @@ class DotWindow(Gtk.Window):

         chooser.set_default_response(Gtk.ResponseType.OK)

         chooser.set_current_folder(self.last_open_dir)

         filter = Gtk.FileFilter()

-        filter.set_name("Graphviz dot files")

+        filter.set_name("Graphviz files")

+        filter.add_pattern("*.gv")

         filter.add_pattern("*.dot")

         chooser.add_filter(filter)

         filter = Gtk.FileFilter()