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diff --git a/src/VBox/Runtime/r3/nt/internal-r3-nt.h b/src/VBox/Runtime/r3/nt/internal-r3-nt.h
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+/* $Id: internal-r3-nt.h $ */
+/** @file
+ * IPRT - Internal Header for the Native NT code.
+ */
+
+/*
+ * Copyright (C) 2010-2023 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_INCLUDED_SRC_r3_nt_internal_r3_nt_h
+#define IPRT_INCLUDED_SRC_r3_nt_internal_r3_nt_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#ifdef IN_SUP_HARDENED_R3
+# include <iprt/nt/nt-and-windows.h>
+#else
+# include <iprt/nt/nt.h>
+#endif
+#include "internal/iprt.h"
+
+
+#if 1
+/** Enables the "\\!\" NT path pass thru as well as hacks for listing NT object
+ * directories. */
+# define IPRT_WITH_NT_PATH_PASSTHRU 1
+#endif
+
+
+
+/**
+ * Internal helper for comparing a WCHAR string with a char string.
+ *
+ * @returns @c true if equal, @c false if not.
+ * @param   pwsz1               The first string.
+ * @param   cch1                The length of the first string, in bytes.
+ * @param   psz2                The second string.
+ * @param   cch2                The length of the second string.
+ */
+DECLINLINE(bool) rtNtCompWideStrAndAscii(WCHAR const *pwsz1, size_t cch1, const char *psz2, size_t cch2)
+{
+    if (cch1 != cch2 * 2)
+        return false;
+    while (cch2-- > 0)
+    {
+        unsigned ch1 = *pwsz1++;
+        unsigned ch2 = (unsigned char)*psz2++;
+        if (ch1 != ch2)
+            return false;
+    }
+    return true;
+}
+
+#endif /* !IPRT_INCLUDED_SRC_r3_nt_internal_r3_nt_h */
+
+/**
+ * Common worker for RTFileSetMode, RTPathSetMode and RTDirRelPathSetMode.
+ *
+ * @returns IPRT status code.
+ * @param   hNativeFile The NT handle to the file system object.
+ * @param   fMode       Valid and normalized file mode mask to set.
+ */
+DECLHIDDEN(int) rtNtFileSetModeWorker(HANDLE hNativeFile, RTFMODE fMode);
+