diff --git a/EduNetworkBuilder/NetworkBuilder.cs b/EduNetworkBuilder/NetworkBuilder.cs
index ce84be9..fe670d4 100644
--- a/EduNetworkBuilder/NetworkBuilder.cs
+++ b/EduNetworkBuilder/NetworkBuilder.cs
@@ -1392,14 +1392,18 @@ namespace EduNetworkBuilder
         {
             OpenFileDialog mydialog = new OpenFileDialog();
             mydialog.AddExtension = true;
-            mydialog.Filter = "EduNet File (*.enbx, *enbu)|*.enbx; *.enbu";
+            //If we have a user loaded, we can open homework files
+            string filter = "EduNet File (*.enbx, *enbu)|*.enbx; *.enbu";
+            if(NB.GetUser() != null)
+                filter = "EduNet File (*.enbx, *enbu, *enbh)|*.enbx; *.enbu; *.enbh";
+            mydialog.Filter = filter;
             mydialog.Multiselect = false;
             mydialog.ShowHelp = true;
             if (LastPath != null && LastPath != "") mydialog.FileName = LastPath;
             DialogResult result = mydialog.ShowDialog();
             if (result == System.Windows.Forms.DialogResult.Cancel) return;
             string extension = Path.GetExtension(mydialog.FileName).ToString();
-            if(extension != ".enbx" && extension != ".enbu")
+            if(extension != ".enbx" && extension != ".enbu" && extension != ".enbh")
             {
                 MessageBox.Show(NB.Translate("_LoadErr"));
                 return;