diff --git a/plugins/xmlsave/src/xml_serializer.cc b/plugins/xmlsave/src/xml_serializer.cc
index 651c940..3f5b1b9 100644
--- a/plugins/xmlsave/src/xml_serializer.cc
+++ b/plugins/xmlsave/src/xml_serializer.cc
@@ -112,7 +112,7 @@ void XMLSerializer::restore_snapshot(const Glib::ustring& filename, History& his
 
 const Glib::ustring XMLSerializer::get_filename_extension()
 {
-  return Glib::ustring("xsgp");
+  return Glib::ustring("xgp");
 }
 
 
diff --git a/src/gui_builder.cc b/src/gui_builder.cc
index dee243c..a52c6dd 100644
--- a/src/gui_builder.cc
+++ b/src/gui_builder.cc
@@ -101,7 +101,7 @@ GuiBuilder::on_file_open_activate()
       Serializer* ser = *iter;
       Gtk::FileFilter filter_sgpem;
       filter_sgpem.set_name(ser->get_filename_description());
-      filter_sgpem.add_pattern(ser->get_filename_extension());
+      filter_sgpem.add_pattern(Glib::ustring("*.") + ser->get_filename_extension());
       dialog.add_filter(filter_sgpem);
     }
 
@@ -166,8 +166,8 @@ GuiBuilder::on_file_saveas_activate()
 
     //Add filters, so that only certain file types can be selected:
     Gtk::FileFilter filter_sgpem;
-    filter_sgpem.set_name("Sgpem files");
-    filter_sgpem.add_pattern("*.xgp");
+    filter_sgpem.set_name(serializer.get_filename_description());
+    filter_sgpem.add_pattern(Glib::ustring("*.") + serializer.get_filename_extension());
     dialog.add_filter(filter_sgpem);
   
     Gtk::FileFilter filter_any;