diff --git a/GraphicsView/demo/Polygon/Polygon_2.cpp b/GraphicsView/demo/Polygon/Polygon_2.cpp
index 7a189a98145..7a4bddbcdae 100644
--- a/GraphicsView/demo/Polygon/Polygon_2.cpp
+++ b/GraphicsView/demo/Polygon/Polygon_2.cpp
@@ -228,7 +228,7 @@ MainWindow::on_actionLoadPolygon_triggered()
   QString fileName = QFileDialog::getOpenFileName(this,
 						  tr("Open Polygon File"),
 						  ".",
-                                                  tr( "Polyline files (*.polygon.cgal);;"
+                                                  tr( "Polyline files (*.polygons.cgal);;"
                                                       "WSL files (*.wsl);;"
                                                       "WKT files (*.wkt *.WKT);;"
                                                       "All file (*)"));
@@ -267,7 +267,7 @@ MainWindow::on_actionSavePolygon_triggered()
   QString fileName = QFileDialog::getSaveFileName(this,
 						  tr("Save Polygon"),
 						  ".",
-                                                  tr( "Polyline files (*.polygon.cgal);;"
+                                                  tr( "Polyline files (*.polygons.cgal);;"
                                                       "WKT files (*.wkt *.WKT);;"
                                                       "All file (*)"));
   if(! fileName.isEmpty()){
diff --git a/GraphicsView/demo/Segment_Delaunay_graph_2/Segment_voronoi_2.cpp b/GraphicsView/demo/Segment_Delaunay_graph_2/Segment_voronoi_2.cpp
index f13c6027137..805873eab21 100644
--- a/GraphicsView/demo/Segment_Delaunay_graph_2/Segment_voronoi_2.cpp
+++ b/GraphicsView/demo/Segment_Delaunay_graph_2/Segment_voronoi_2.cpp
@@ -238,7 +238,7 @@ void
 MainWindow::open(QString fileName)
 {
   if(! fileName.isEmpty()){
-    if(fileName.endsWith(".polygon.cgal")){
+    if(fileName.endsWith(".polygons.cgal")){
       loadPolygonConstraints(fileName);
       this->addToRecentFiles(fileName);
     } else if(fileName.endsWith(".edg")){
@@ -258,7 +258,7 @@ MainWindow::on_actionLoadSegments_triggered()
 						  tr("Open Constraint File"),
 						  ".",
 						  tr("Edge files (*.edg);;"
-                                                     "Polyline files (*.polygon.cgal);;"
+                                                     "Polyline files (*.polygons.cgal);;"
                                                      "WKT files (*.wkt *.WKT)"));
   open(fileName);
 }
diff --git a/GraphicsView/demo/Segment_Delaunay_graph_Linf_2/Segment_voronoi_linf_2.cpp b/GraphicsView/demo/Segment_Delaunay_graph_Linf_2/Segment_voronoi_linf_2.cpp
index 39d7cbc358a..c70e143792c 100644
--- a/GraphicsView/demo/Segment_Delaunay_graph_Linf_2/Segment_voronoi_linf_2.cpp
+++ b/GraphicsView/demo/Segment_Delaunay_graph_Linf_2/Segment_voronoi_linf_2.cpp
@@ -253,7 +253,7 @@ void
 MainWindow::open(QString fileName)
 {
   if(! fileName.isEmpty()){
-    if(fileName.endsWith(".polygon.cgal")){
+    if(fileName.endsWith(".polygons.cgal")){
       loadPolygonConstraints(fileName);
       this->addToRecentFiles(fileName);
     } else if(fileName.endsWith(".edg")){
@@ -287,7 +287,7 @@ MainWindow::on_actionLoadSegments_triggered()
                                     "Pin  files (*.pin);;" 
                                     "Pts  files (*.pts);;"
                                     "Edge files (*.edg);;"
-                                    "Polylines files (*.polygon.cgal);;"
+                                    "Polylines files (*.polygons.cgal);;"
                                     "WKT files (*.WKT *.wkt)"
                                                           ));
   open(fileName);
diff --git a/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp b/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
index f99993a3251..86267e75821 100644
--- a/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
+++ b/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
@@ -514,7 +514,7 @@ MainWindow::open(QString fileName)
       else
         return;
     }
-    if(fileName.endsWith(".polygon.cgal")){
+    if(fileName.endsWith(".polygons.cgal")){
       loadPolygonConstraints(fileName);
     } else if(fileName.endsWith(".cpts.cgal")){
       loadFile(fileName);
@@ -538,7 +538,7 @@ MainWindow::on_actionLoadConstraints_triggered()
 						  tr("Open Constraint File"),
 						  ".",
 						  tr("Edge files (*.edg);;"
-                                                     "Polyline files (*.polygon.cgal);;"
+                                                     "Polyline files (*.polygons.cgal);;"
                                                      "Poly files (*.poly);;"
                                                      "CGAL files (*.cpts.cgal);;"
                                                      "WKT files (*.WKT *.wkt);;"