diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/CMakeLists.txt b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/CMakeLists.txt
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/CMakeLists.txt
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/CMakeLists.txt
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/filenew.xpm b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/filenew.xpm
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/filenew.xpm
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/filenew.xpm
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/fileopen.xpm b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/fileopen.xpm
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/fileopen.xpm
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/fileopen.xpm
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/fileprint.xpm b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/fileprint.xpm
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/fileprint.xpm
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/fileprint.xpm
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/filesave.xpm b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/filesave.xpm
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/filesave.xpm
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/filesave.xpm
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_vertex_base_with_info_2.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/CGAL/Segment_Delaunay_graph_vertex_base_with_info_2.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/CGAL/Segment_Delaunay_graph_vertex_base_with_info_2.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/CGAL/Segment_Delaunay_graph_vertex_base_with_info_2.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/Which_diagram.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/Which_diagram.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/Which_diagram.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/Which_diagram.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/pdg_draw.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/pdg_draw.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/pdg_draw.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/pdg_draw.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/pdg_insert.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/pdg_insert.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/pdg_insert.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/pdg_insert.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/sdg_draw.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/sdg_draw.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/sdg_draw.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/sdg_draw.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/sdg_insert.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/sdg_insert.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/include/sdg_insert.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/include/sdg_insert.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/makefile b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/makefile
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/makefile
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/makefile
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/my_window.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/my_window.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/my_window.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/my_window.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/pdg_typedefs.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/pdg_typedefs.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/pdg_typedefs.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/pdg_typedefs.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/polygon_delaunay_graph_2.cpp b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/polygon_delaunay_graph_2.cpp
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/polygon_delaunay_graph_2.cpp
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/polygon_delaunay_graph_2.cpp
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_file_toolbar.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_file_toolbar.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_file_toolbar.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_file_toolbar.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_layers.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_layers.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_layers.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_layers.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_layers_toolbar.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_layers_toolbar.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/qt_layers_toolbar.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/qt_layers_toolbar.h
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/segment_delaunay_graph_2.cpp b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/segment_delaunay_graph_2.cpp
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/segment_delaunay_graph_2.cpp
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/segment_delaunay_graph_2.cpp
diff --git a/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/typedefs.h b/Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/typedefs.h
similarity index 100%
rename from Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/typedefs.h
rename to Segment_Delaunay_graph_2/demo/Segment_Delaunay_graph_2/Qt3/typedefs.h