title: What are common file extensions for web programming languages?
body: <p>What file extensions are used most commonly by different languages? Please don't put source file names (like .java) but rather extensions that would be present in a URL for rendered pages.</p>
  <p>Here is my (alphabetized) list so far</p>
  <ul>
  <li>ASP Classic</li>
  <li>asp</li>
  <li>ASP.NET</li>
  <li>aspx</li>
  <li>axd</li>
  <li>asx</li>
  <li>asmx</li>
  <li>ashx</li>
  <li>CSS</li>
  <li>css</li>
  <li>Coldfusion</li>
  <li>cfm</li>
  <li>Erlang</li>
  <li>yaws</li>
  <li>Flash</li>
  <li>swf</li>
  <li>HTML</li>
  <li>html</li>
  <li>htm</li>
  <li>xhtml</li>
  <li>jhtml</li>
  <li>Java</li>
  <li>jsp</li>
  <li>jspx</li>
  <li>wss</li>
  <li>do</li>
  <li>action</li>
  <li>JavaScript</li>
  <li>js</li>
  <li>Perl</li>
  <li>pl</li>
  <li>PHP</li>
  <li>php</li>
  <li>php4</li>
  <li>php3</li>
  <li>phtml</li>
  <li>Python</li>
  <li>py</li>
  <li>Ruby</li>
  <li>rb</li>
  <li>rhtml</li>
  <li>SSI</li>
  <li>shtml</li>
  <li>TS</li>
  <li>XML</li>
  <li>xml</li>
  <li>rss</li>
  <li>svg</li>
  <li>Other (C, perl etc.)</li>
  <li>cgi</li>
  <li>dll</li>
  </ul>
  <p>Any more? I'll keep updating this based on comments. Largest correct additions (or deletions) is the accepted answer.</p>
  <p>Aside: This is for comparing language use online: <a href="http://blog.paulisageek.com/2009/10/file-extensions-on-internet.html" rel="nofollow noreferrer">http://blog.paulisageek.com/2009/10/file-extensions-on-internet.html</a></p>