New file, not yet part of build

xpinstall/public/nsPIXPIStubHook.idl

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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, 
+ * released March 31, 1998. 
+ *
+ * The Initial Developer of the Original Code is Netscape Communications 
+ * Corporation.  Portions created by Netscape are 
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ *
+ * Contributors:
+ *     Daniel Veditz <dveditz@netscape.com>
+ */
+
+#include "nsISupports.idl"
+#include "nsIFileSpec.idl"
+
+/**
+ * nsPIXPIStubHook
+ *
+ * Used by the Install Wizard to point at the eventual target dir and
+ * override the default assumption that the wizard itself is the program.
+ */
+[uuid(089929F0-4ED9-11d3-ABDD-000064657374)]
+interface nsPIXPIStubHook : nsISupports
+{
+        void    SetProgramDirectory(in nsIFileSpec dir);
+};