Update Windows installer for 2.1b2.
diff --git a/PCbuild/BUILDno.txt b/PCbuild/BUILDno.txt
index 7de90bd..9aab842 100644
--- a/PCbuild/BUILDno.txt
+++ b/PCbuild/BUILDno.txt
@@ -33,6 +33,8 @@
 
 Windows Python BUILD numbers
 ----------------------------
+  12    2.1b2
+        20-Mar-2001
   11    2.1b1
         28-Feb-2001
   10    2.1a2