title: Difference between application/vnd.xls and application/vnd.ms-excel
body: <p>In my c#.NET MVC application you can download an excel file (with the Nuget EPPlus). To send the file to user I set content type as it follows: </p>
  
  <pre><code>System.Web.HttpContext.Current.Response.ContentType = "application/vnd.xls";
  </code></pre>
  
  <p>What is the difference with:</p>
  
  <pre><code>System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
  </code></pre>
  
  <p>Which one should I use?</p>