Dot Php Pages
This Plugin Adds .php Extension to Your Pages Like http://www.yoursitename.com/yourpage.php WARNING: FIRST DEACTIVATE THE OTHER EXTENSION PAGES PLUGIN. Just Activate The Plugin And Enjoy PHP Pages.
KSM (http://ksmughal.com)
/wp-content/plugins/
directoryAppends dot-php-pages to the URL of PAGES when using permalinks.
It works On WordPress 2.5.1 to WordPress 3.0.1
FIRST DEACTIVATE THE OTHER EXTENSION PAGES PLUGIN LIKE .html on pages.
It works On Custom Permalinks.
Settings->Permalinks->Custom Structure
/%postname%.