hmemcpy16 is a Win16 API, the macro is hmemcpy.

diff --git a/include/windowsx.h b/include/windowsx.h
index b43343a..4ba4939 100644
--- a/include/windowsx.h
+++ b/include/windowsx.h
@@ -1413,7 +1413,7 @@
 #define _nmsize     _msize
 #define _nrealloc   realloc
 #define _nstrdup    _strdup
-#define hmemcpy16     MoveMemory
+#define hmemcpy     MoveMemory
 
 #ifdef __cplusplus
 }