diff --git a/toolkit/xre/nsNativeAppSupportOS2.h b/toolkit/xre/nsNativeAppSupportOS2.h
new file mode 100644
index 000000000000..cd90a7bc0a11
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+++ b/toolkit/xre/nsNativeAppSupportOS2.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (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/MPL/
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * Contributor(s): 
+ *   Bill Law       law@netscape.com
+ *   IBM Corp.
+ */
+
+// Splash screen dialog ID.
+#define IDD_SPLASH  100
+
+// Splash screen bitmap ID.
+#define IDB_SPLASH  101
+
+// DDE application name
+#define ID_DDE_APPLICATION_NAME 102
+