diff --git a/AlgebraicDataflowArchitectureModel/src/graphicalrefactor/actions/OpenAction.java b/AlgebraicDataflowArchitectureModel/src/graphicalrefactor/actions/OpenAction.java
index dac48f9..50a0102 100644
--- a/AlgebraicDataflowArchitectureModel/src/graphicalrefactor/actions/OpenAction.java
+++ b/AlgebraicDataflowArchitectureModel/src/graphicalrefactor/actions/OpenAction.java
@@ -5,6 +5,7 @@
 
 import javax.swing.JFileChooser;
 import javax.swing.filechooser.FileFilter;
+import javax.swing.filechooser.FileNameExtensionFilter;
 
 import graphicalrefactor.editor.Editor;
 import graphicalrefactor.views.GraphicalRefactor;
@@ -29,6 +30,9 @@
 
 			JFileChooser fc = new JFileChooser(wd);
 
+			FileFilter model = new FileNameExtensionFilter("model",".model");
+			FileFilter dtram = new FileNameExtensionFilter("dtram", ".dtram");
+			
 			// Adds file filter for supported file format
 			FileFilter defaultFilter = new FileFilter() {
 
@@ -42,7 +46,10 @@
 					return null;
 				}
 			};
+			
 			fc.addChoosableFileFilter(defaultFilter);
+			fc.addChoosableFileFilter(model);
+			fc.addChoosableFileFilter(dtram);
 			int rc = fc.showDialog(null, "Open Model File");
 			if (rc == JFileChooser.APPROVE_OPTION) {
 				lastDir = fc.getSelectedFile().getParent();