<% File.filetype %>
macro rendering the file extension from the name

Sourcecode in File/macros.js:
1:   function filetype_macro(param) {
2:      var i = this.name.lastIndexOf(".");
3:      if (i > -1)
4:         res.write(this.name.substring(i+1, this.name.length));
5:      return;
6:   }