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diff --git a/zen/process_exec.h b/zen/process_exec.h
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+// *****************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
+// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
+// *****************************************************************************
+
+#ifndef SHELL_EXECUTE_H_23482134578134134
+#define SHELL_EXECUTE_H_23482134578134134
+
+#include "file_error.h"
+
+
+namespace zen
+{
+Zstring escapeCommandArg(const Zstring& arg);
+
+
+DEFINE_NEW_SYS_ERROR(SysErrorTimeOut)
+[[nodiscard]] std::pair<int /*exit code*/, Zstring> consoleExecute(const Zstring& cmdLine, std::optional<int> timeoutMs); //throw SysError, SysErrorTimeOut
+/* Windows: - cmd.exe returns exit code 1 if file not found (instead of throwing SysError) => nodiscard!
+ - handles elevation when CreateProcess() would fail with ERROR_ELEVATION_REQUIRED!
+ - no support for UNC path and Unicode on Win7; apparently no issue on Win10!
+ Linux/macOS: SysErrorTimeOut leaves zombie process behind if timeoutMs is used */
+
+void openWithDefaultApp(const Zstring& itemPath); //throw FileError
+}
+
+#endif //SHELL_EXECUTE_H_23482134578134134
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