Windows build number for 2.3.4c1 is 52.
diff --git a/PCbuild/BUILDno.txt b/PCbuild/BUILDno.txt
index 9bc83b0..eec3105 100644
--- a/PCbuild/BUILDno.txt
+++ b/PCbuild/BUILDno.txt
@@ -33,7 +33,9 @@
 
 Windows Python BUILD numbers
 ----------------------------
-  51    2.3.3
+  52    2.3.4c1
+        13-May-2004
+  51    2.3.3 (final)
         19-Dec-2003
   50    2.3.3c1
         5-Dec-2003