title: How to see Ruby source code in Windows
body: <p>I've been trying to open Ruby source code on my Windows machine but a black box appear for less than a second and then close without showing anything, I've tried to open it with  "command prompt with ruby" using File.open method but it keeps showing an error: </p>
  
  <blockquote>
    <p>File.open is not recognized as an internal or external command, operable program or batch file.</p>
  </blockquote>