Record 2.2.3c1 Windows build number.
diff --git a/PCbuild/BUILDno.txt b/PCbuild/BUILDno.txt
index 42aaeb4..ea927b3 100644
--- a/PCbuild/BUILDno.txt
+++ b/PCbuild/BUILDno.txt
@@ -33,6 +33,8 @@
 
 Windows Python BUILD numbers
 ----------------------------
+  41    2.2.3c1
+        22-May-2003
   40    2.3b1
         25-Apr-2003
   39    2.3a2