Permalinks….Ahhhhh!

Hi,

Its simple

Just add .html at end .. simply write /%postname%.html in the custom structure box

If you want it for pages you can check it at

http://www.introsites.co.uk/wordpress/html-on-pages-plugin.html

Some more information on permalinks is stated on my wordpress seo blog ..Please feel free to have a look

http://way2wp.com/changing-wordpress-permalinks-for-better-rankings-47

Hope it helped you

with regards

sribharath