Here is a link to the full WC results. Cody Warren was the top placing American--in 19th place.
http://www.uci.ch/imgarchive/MTB/World Championships/2005/LIVIGNO_DHI_MenElite_results.pdf
http://www.uci.ch/imgarchive/MTB/World Championships/2005/LIVIGNO_DHI_MenElite_results.pdf