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diff --git a/include/iprt/formats/mz.mac b/include/iprt/formats/mz.mac
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+;; @file
+; IPRT - MZ (DOS Executable Header) definitions for YASM/NASM.
+;
+
+;
+; Copyright (C) 2006-2022 Oracle and/or its affiliates.
+;
+; This file is part of VirtualBox base platform packages, as
+; available from https://www.virtualbox.org.
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the GNU General Public License
+; as published by the Free Software Foundation, in version 3 of the
+; License.
+;
+; This program is distributed in the hope that it will be useful, but
+; WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+; General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program; if not, see <https://www.gnu.org/licenses>.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+; in the VirtualBox distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+;
+
+%ifndef ___iprt_formats_mz_mac
+%define ___iprt_formats_mz_mac
+
+struc IMAGE_DOS_HEADER
+ .e_magic resw 1
+ .e_cblp resw 1
+ .e_cp resw 1
+ .e_crlc resw 1
+ .e_cparhdr resw 1
+ .e_minalloc resw 1
+ .e_maxalloc resw 1
+ .e_ss resw 1
+ .e_sp resw 1
+ .e_csum resw 1
+ .e_ip resw 1
+ .e_cs resw 1
+ .e_lfarlc resw 1
+ .e_ovno resw 1
+ .e_res resw 4
+ .e_oemid resw 1
+ .e_oeminfo resw 1
+ .e_res2 resw 10
+ .e_lfanew resd 1
+endstruc
+
+%ifndef IMAGE_DOS_SIGNATURE
+ %define IMAGE_DOS_SIGNATURE 0x5a4d
+%endif
+
+%endif
+