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diff --git a/widget/windows/filedialog/WinFileDialogCommands.h b/widget/windows/filedialog/WinFileDialogCommands.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef widget_windows_filedialog_WinFileDialogCommands_h__
+#define widget_windows_filedialog_WinFileDialogCommands_h__
+
+#include "mozilla/widget/filedialog/WinFileDialogCommandsDefn.h"
+
+// Windows interface type, defined in <shobjidl_core.h>
+struct IFileDialog;
+
+namespace mozilla::widget::filedialog {
+// Apply the selected commands to the IFileDialog, in preparation for showing
+// it. (The actual showing step is left to the caller.)
+[[nodiscard]] nsresult ApplyCommands(::IFileDialog*,
+ nsTArray<Command> const& commands);
+
+// Extract one or more results from the file-picker dialog.
+//
+// Requires that Show() has been called and has returned S_OK.
+mozilla::Result<Results, nsresult> GetFileResults(::IFileDialog*);
+
+// Extract the chosen folder from the folder-picker dialog.
+//
+// Requires that Show() has been called and has returned S_OK.
+mozilla::Result<nsString, nsresult> GetFolderResults(::IFileDialog*);
+} // namespace mozilla::widget::filedialog
+
+#endif // widget_windows_filedialog_WinFileDialogCommands_h__