Magic strings in both Python and the Wise installer define the registry key
to be used in Windows.  They got out of synch.  Repaired that, and added
comments to each one pointing at the other.
diff --git a/PCbuild/python20.wse b/PCbuild/python20.wse
index f9bb5c4..cc9be9f 100644
--- a/PCbuild/python20.wse
+++ b/PCbuild/python20.wse
@@ -70,9 +70,12 @@
   Variable=GROUP
   Value=Python 2.1
 end
+item: Remark
+  Text=PY_VERSION should be major.minor only; used to create the registry key; must match MS_DLL_ID in python_nt.rc
+end
 item: Set Variable
   Variable=PY_VERSION
-  Value=2.1b1
+  Value=2.1
 end
 item: Set Variable
   Variable=MAINDIR