http:/ /help.joomla.org/content/view/1445/278/
Looks like its in the Joomla Global configuration.
QUOTE
SEO Settings
SEO stands for Search Engine Optimization.
Search Engine Friendly URLs. When set to Yes, URLs are rewritten to be more friendly for search engine spiders. For example, the URL: www.example.com/index.php?option=com_content&view=etc..., would turn into: www.example.com/alias. Most of the items created in Joomla! have an Alias box where a search engine friendly URL can be inserted. The default setting is No.
Use Apache mod_rewrite. When set to Yes, Joomla! will use the mod_rewrite settings of Apache when creating search engine friendly URLs. Please note: it is advised that you do not modify any .htaccess file without an understanding of how it works. You must use the .htaccess file provided with Joomla! in order to use this setting. To use this file, rename the htaccess.txt file (found in the root directory) to .htaccess. By default, this setting is set to No.
Add suffix to URLs. When set to Yes, Joomla! will add .html to the end of the URLs. The default setting is No
Edited by Randy, 17 April 2008 - 08:48 AM.
Live url broken per forum rules.