Oh ! Search Engine Friendly URL’s a big problem

Hi every one!
I want to change my database links into search engine frindly urls i.e html or htm . All links generted from datbase but crawl in search engine as .html extension. some where on net i read we can do this with our .htaccess file
In this file we rewrite engine technology and all cat and Id database link change into .html format. if you have any idea or example about this then please write here for me and all other seekers.

Thanks waiting your possitive responce
main riz

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