Thanks, so I'm currently using the code below in a .htaccess file and still nothing works, it's strange because I would go to the link without the extention and shows the page without structure. Not sure what's wrong.
Code:
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^([a-z]+_?[a-z]+)/$ /$1.php