title: Windows command line search for exact extension with dir
body: <p>When I do a search:</p>
  
  <pre><code>dir /b /s *.txt
  </code></pre>
  
  <p>I get all files/folders with the extension <code>.txt</code>. But I also get them when they have an extension like <code>.txtx</code>. How can I search for the exact extension?</p>