diff -r e8d89503f061 Lib/idlelib/GrepDialog.py
--- a/Lib/idlelib/GrepDialog.py	Sat May 26 20:44:45 2012 -0400
+++ b/Lib/idlelib/GrepDialog.py	Sun May 27 17:17:19 2012 -0500
@@ -81,7 +81,7 @@
         hits = 0
         for fn in list:
             try:
-                f = open(fn)
+                f = open(fn, errors='replace')
             except IOError as msg:
                 print(msg)
                 continue