title: What is the .dockerfile extension?
body: <p>Visual Studio Code (1.22.2) offers a file extension named <code>.dockerfile</code> in the the save dialog. What is a file with this extension? A Dockerfile is in all documentation and examples, that I've seen so far, only called <code>Dockerfile</code>. </p>
  
  <p><a href="https://i.stack.imgur.com/tSshn.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tSshn.png" alt="enter image description here"></a></p>
  
  <p>If I enter <code>Dockerfile</code> as a file name, a file named <code>Dockerfile.dockerfile</code> is created.</p>