Index: __init__.py
===================================================================
--- __init__.py	(revision 72225)
+++ __init__.py	(working copy)
@@ -281,9 +281,10 @@
                         [(feature.id, component)])
 
     def make_short(self, file):
-        parts = file.split(".")
-        if len(parts)>1:
-            suffix = parts[-1].upper()
+        # return a tuple with the name of file and its extension
+        parts = os.path.splitext(file)
+        if parts[1]: # if the file don't has a extension, parts[1] = ''
+            suffix = parts[1].upper()
         else:
             suffix = None
         prefix = parts[0].upper()