You have two options in the control panel.
Control Panel » Primary Settings
Enable Spider-friendly URLs?
Warning: This function allows most search engine spiders to crawl the community and also allows for specially formatted URLs, which may result in higher bandwidth usage and server load.
Note: The PATH_INFO environmental variable must be available for this feature to function properly.
Enable HTML Extension:
At least I think they are both there for your version.
Last edited by Ruben Rocha; 01/20/2009 2:31 PM.