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diff --git a/private/ntos/tdi/tcpip/h/packon.h b/private/ntos/tdi/tcpip/h/packon.h
new file mode 100644
index 000000000..f2c73cb85
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+++ b/private/ntos/tdi/tcpip/h/packon.h
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+/*++
+
+Copyright (c) 1990,91  Microsoft Corporation
+
+Module Name:
+
+    packon.h
+
+Abstract:
+
+    This file turns packing of structures on.  (That is, it disables
+    automatic alignment of structure fields.)  An include file is needed
+    because various compilers do this in different ways.
+
+    The file packoff.h is the complement to this file.
+
+Author:
+
+    Chuck Lenzmeier (chuckl) 4-Mar-1990
+
+Revision History:
+
+    15-Apr-1991 JohnRo
+        Created lint-able variant.
+--*/
+
+#if ! (defined(lint) || defined(_lint))
+
+#ifndef VXD
+#if i386
+#pragma warning(disable:4103)
+#endif
+#endif
+#pragma pack(1)                 // x86, MS compiler; MIPS, MIPS compiler
+#endif // ! (defined(lint) || defined(_lint))