title: "Could not find a part of the path" error while creating Mutex
body: <p>I'm baffled by this, can someone tell me why, when I call:</p>
  
  <pre><code>using (Mutex mtx = new Mutex(false, strId))
  {
  }
  </code></pre>
  
  <p>I get this exception:</p>
  
  <blockquote>
    <p>Could not find a part of the path.</p>
  </blockquote>
  
  <p>If <code>strId</code> is set to something like <code>localhost\SQLEXPRESS-MyName-2</code>?</p>