The default extension is set in web.xml. It's not a Seam thing, it's a JSF thing. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4021165#4021165 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4021165