--- mstools/h/winnls.h	2018/08/09 18:20:29	1.1.1.2
+++ mstools/h/winnls.h	2018/08/09 18:21:06	1.1.1.3
@@ -458,6 +458,7 @@ typedef struct _cpinfo {
 /*
  *  Code Page Dependent APIs.
  */
+BOOL   APIENTRY  IsValidCodePage(UINT CodePage);
 UINT   APIENTRY  GetACP(void);
 UINT   APIENTRY  GetOEMCP(void);
 BOOL   APIENTRY  GetCPInfo(UINT, LPCPINFO);