diff -r ad51ed93377c Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Thu Oct 11 00:11:26 2012 -0700
+++ b/Lib/idlelib/EditorWindow.py	Mon Oct 22 21:38:23 2012 -0500
@@ -638,7 +638,8 @@
         if not filename:
             tkMessageBox.showerror(
                 "No filename",
-                "This buffer has no associated filename",
+                ("This buffer has no associated filename. " +
+                 "Please save this buffer to a file and try again."),
                 master=self.text)
             self.text.focus_set()
             return None