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.

PC/python_nt.rc

@@ -11,6 +11,7 @@
 /* Across releases, change:
  *    MS_DLL_ID if the minor version number changes.
  *    PYTHON_DLL_NAME ditto.
+ * MS_DLL_ID must match PY_VERSION in the Windows install script.
  */
 #define MS_DLL_ID "2.1"
 

PCbuild/python20.wse

@@ -70,9 +70,12 @@ item: Set Variable
   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