Lots of new defines and stubs.

diff --git a/include/ddeml.h b/include/ddeml.h
index 0f58384..79c12f0 100644
--- a/include/ddeml.h
+++ b/include/ddeml.h
@@ -10,6 +10,8 @@
 
 #include "wintypes.h"
 
+#define MSGF_DDEMGR 0x8001
+
 typedef DWORD HCONVLIST;
 typedef DWORD HCONV;
 typedef DWORD HSZ;