diff --git a/include/Mw/StringDefs.h b/include/Mw/StringDefs.h
index f1ebf8f..ff19432 100644
--- a/include/Mw/StringDefs.h
+++ b/include/Mw/StringDefs.h
@@ -47,5 +47,6 @@
 #define MwNcloseHandler "Cclose"	   /* NULL */
 #define MwNfocusInHandler "CfocusIn"	   /* NULL */
 #define MwNfocusOutHandler "CfocusOut"	   /* NULL */
+#define MwNfileChosenHandler "CfileChosen"	   /* char* */
 
 #endif
diff --git a/include/Mw/TypeDefs.h b/include/Mw/TypeDefs.h
index 92220ac..5f45f49 100644
--- a/include/Mw/TypeDefs.h
+++ b/include/Mw/TypeDefs.h
@@ -45,6 +45,10 @@ typedef unsigned __int64 MwOffset;
 typedef unsigned long MwOffset; /* out of hope */
 #endif
 
+typedef unsigned char MwBool;
+#define MwTRUE ((MwBool)1)
+#define MwFALSE ((MwBool)0)
+
 #include <Mw/LowLevel.h>
 
 struct _MwPoint {