diff --git a/EduNetworkBuilder/NetworkBuilder.cs b/EduNetworkBuilder/NetworkBuilder.cs
index fe670d4..9a86b46 100644
--- a/EduNetworkBuilder/NetworkBuilder.cs
+++ b/EduNetworkBuilder/NetworkBuilder.cs
@@ -1708,6 +1708,14 @@ namespace EduNetworkBuilder
                     CurrentUser = PPF.Edit(); //This does the form as dialog.  When we come back, update the menu.
                     UpdateMenu();
                 }
+                else if (extension == ".enbh")
+                {
+                    if(NB.GetUser() == null)
+                    {
+                        MessageBox.Show(NB.Translate("NB_LoadUserFirst"));
+                        return;
+                    }
+                }
                 else
                 {
                     MessageBox.Show(NB.Translate("NB_InvalidFile"));
diff --git a/EduNetworkBuilder/Resources/languages/edustrings.resx b/EduNetworkBuilder/Resources/languages/edustrings.resx
index 9d66831..d465bd3 100644
--- a/EduNetworkBuilder/Resources/languages/edustrings.resx
+++ b/EduNetworkBuilder/Resources/languages/edustrings.resx
@@ -1765,6 +1765,10 @@
     <value>Are you sure you want to delete this homework?</value>
     <comment>PPF_ConfirmHWDelete = Are you sure you want to delete this homework?</comment>
   </data>
+  <data name="NB_LoadUserFirst" xml:space="preserve">
+    <value>You must load a user profile before you can open a homework file.</value>
+    <comment>NB_LoadUserFirst = You must load a user profile before you can open a homework file.</comment>
+  </data>
   <data name="PPF_ChangePassword" xml:space="preserve">
     <value>Change Password</value>
     <comment>PPF_ChangePassword = Change Password</comment>