EDIT: current .htaccess file:
Options +FollowSymLinks -MultiViews # Turn mod_rewrite on RewriteEngine On RewriteBase / ## hide .php extension snippet # To
try this.
RewriteEngine on RewriteCond %{SCRIPT_FILENAME} !-d RewriteCond %{SCRIPT_FILENAME} !-f RewriteRule ^(.*)$ $1.php [L,QSA]
if this not work then your sever do not have mod_rewrite activated or support url rewriting.