title: Directory.GetFiles(path, ".txt", SearchOption.AllDirectories); doesn't deliver a file
body: <p>How would I search all the files in directory and all its sub directories for a specific extension</p>
  
  <pre><code>Directory.GetFiles(path, ".txt", SearchOption.AllDirectories);
  </code></pre>
  
  <p>The code above returns no files</p>