title: Execute kotlin files with extension other than kt
body: <p>In kotlin documentation I found, the kotlin file extension is always <code>.kt</code></p>
  
  <p>E.g. <a href="https://kotlinlang.org/docs/reference/coding-conventions.html" rel="nofollow noreferrer">Source file names</a>:</p>
  
  <blockquote>
    <p>If a Kotlin file contains a single class (potentially with related top-level declarations), its name should be the same as the name of the class, <strong>with the .kt extension appended</strong></p>
  </blockquote>
  
  <p>Can kotlin execute files with kotlin code, but with extension other than kt?</p>
  
  <p>When I tried to change extenstion I get an error:</p>
  
  <pre><code>error: source entry is not a Kotlin file:
  </code></pre>