Index: ZConfig/loader.py
===================================================================
--- ZConfig/loader.py	(révision 102353)
+++ ZConfig/loader.py	(copie de travail)
@@ -135,7 +135,7 @@
             # are always Windows drive letters; I don't know of any
             # one-character scheme identifiers.
             scheme, rest = urllib.splittype(s)
-            return len(scheme) == 1
+            return scheme is None or len(scheme) == 1
         else:
             return True