Ought to I make up filename extensions to enhance my rankings?

Knowing that the keywords in a url is one of (many) factors used to rank a site, what about the impact of the filename suffix. In theory, if I replaced .php with .free would that impact on search results? IanVisits, London, UK

Have a question? Ask it in our Webmaster Help Forum: http://www.google.com/support/forum/p/Webmasters?hl=en

Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: http://twitter.com/googlewmc

More videos: http://www.youtube.com/GoogleWebmasterHelp
Webmaster Central Blog: http://googlewebmastercentral.blogspot.com/
Webmaster Central: http://www.google.com/webmasters

source