The usual
diff --git a/Lib/dos-8x3/multifil.py b/Lib/dos-8x3/multifil.py
index cc8f43c..e43d331 100755
--- a/Lib/dos-8x3/multifil.py
+++ b/Lib/dos-8x3/multifil.py
@@ -30,7 +30,8 @@
 import sys
 import string
 
-Error = 'multifile.Error'
+class Error(Exception):
+	pass
 
 class MultiFile: