diff --git a/mps/src/prmcw3.h b/mps/src/prmcw3.h
new file mode 100644
index 00000000000..1bb1e98e430
--- /dev/null
+++ b/mps/src/prmcw3.h
@@ -0,0 +1,23 @@
+/* impl.h.prmcw3:  PROTECTION FOR WIN32
+ *
+ * $HopeName: $
+ * Copyright (C) 1998, 1999 The Harlequin Group Limited.  All rights reserved.
+ *
+ * .readership: MPS developers.
+ */
+
+#ifndef prmcw3_h
+#define prmcw3_h
+
+
+#include "mpm.h"
+
+#include "mpswin.h"
+
+
+typedef struct MutatorFaultContextStruct { /* Protection fault context data */
+  LPEXCEPTION_POINTERS ep;                   /* Windows Exception Pointers */
+} MutatorFaultContextStruct;
+
+
+#endif /* prmcw3_h */