ProcessStartInfo - 动词不起作用

Question

我用过

ProcessStartInfo startInfo = new ProcessStartInfo(filepath);

if (File.Exists(filepath))
{
    var i = 0;
    foreach (String verb in startInfo.Verbs)
    {
        // Display the possible verbs.
        Console.WriteLine("  {0}. {1}", i.ToString(), verb);
        i++;
    }
}

要找到所选文件的可用动词，请尝试..

ProcessStartInfo psi = new ProcessStartInfo(filepath);
psi.Verb = "OpenAsReadOnly";
Process wordProcess = System.Diagnostics.Process.Start(psi);

我试图打开的文件（excel）没有以只读方式打开。我做错了什么？