title: Is .htc file a good practice in older versions of IE for rounded corners like CSS3 has?
body: <p>I am trying to make the simple html button with rounder corner using CSS3 but for IE i am using .htc file for round curve, is the .htc file using is good habit or bad i am not able to judgment to use this .html file.</p>
  
  <p>My another worries is that progressive enhancement allow to use .htc file or not.</p>
  
  <p>Please also tell me if there are some disadvantages to use .htc file.</p>
  
  <p>I am new to css3, help much appreciated.</p>