diff --git a/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp b/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
index af3a4f973d6..fa8e2ece336 100644
--- a/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
+++ b/GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp
@@ -234,6 +234,8 @@ public slots:
 
   void on_actionLoadConstraints_triggered();
 
+  void loadFile(QString);
+
   void loadPolygonConstraints(QString);
 
   void loadEdgConstraints(QString);
@@ -423,7 +425,10 @@ void
 MainWindow::open(QString fileName)
 {
   if(! fileName.isEmpty()){
-    if(fileName.endsWith(".plg")){
+    if(fileName.endsWith(".cgal")){
+      loadFile(fileName);
+      this->addToRecentFiles(fileName);
+    } else if(fileName.endsWith(".plg")){
       loadPolygonConstraints(fileName);
       this->addToRecentFiles(fileName);
     } else if(fileName.endsWith(".edg")){
@@ -444,6 +449,18 @@ MainWindow::on_actionLoadConstraints_triggered()
   open(fileName);
 }
 
+void
+MainWindow::loadFile(QString fileName)
+{
+  std::ifstream ifs(qPrintable(fileName));
+  ifs >> cdt;
+  if(!ifs) abort();
+  initializeID(cdt);
+  discoverComponents(cdt);
+  emit(changed());
+  actionRecenter->trigger();
+}
+
 void
 MainWindow::loadPolygonConstraints(QString fileName)
 {