title: MIME type of file returning empty in javascript on some machines
body: <p>I have a javascript snippet written which checks for the mime type of the files.</p>
  
  <p><code>var type = this.files[0].type;</code></p>
  
  <p>Code was running fine for a long time but now somehow its not able to find value of file type. </p>
  
  <p>I checked in browser's debug tool and find mime type of file is blank.</p>
  
  <p>Issues is happening on some machines only and running fine on others,
  although both machines are running on <strong>Windows 10</strong> and using same version of <strong>google chrome</strong> (version 68.0.3440.84).</p>
  
  <p>Any idea?</p>