MIDL_STUB_MESSAGE needs a pack4 for the MaxCount field.

include/rpcndr.h

@@ -51,6 +51,7 @@ typedef struct _NDR_PIPE_MESSAGE *PNDR_PIPE_MESSAGE;
 typedef struct _NDR_ASYNC_MESSAGE *PNDR_ASYNC_MESSAGE;
 typedef struct _NDR_CORRELATION_INFO *PNDR_CORRELATION_INFO;
 
+#include "pshpack4.h"
 typedef struct _MIDL_STUB_MESSAGE
 {
   PRPC_MESSAGE RpcMsg;
@@ -107,6 +108,7 @@ typedef struct _MIDL_STUB_MESSAGE
   void *pMemoryList;
   ULONG_PTR w2kReserved[5];
 } MIDL_STUB_MESSAGE, *PMIDL_STUB_MESSAGE;
+#include "poppack.h"
 
 typedef struct _GENERIC_BINDING_ROUTINE_PAIR GENERIC_BINDING_ROUTINE_PAIR, *PGENERIC_BINDING_ROUTINE_PAIR;