i active URL rewritnig at GYM main panel but when i click http://www.thefreetutorials.com/forum/gymrss.php this link show 404 error

When i Click my this link http://www.thefreetutorials.com/forum/gymrss.php .... it show me this link http://www.thefreetutorials.com/forum/rss/rss.xml but i got a error page like 404 error i change my .htaccess Here is my .htaccess code if any error there plz solve it and help me thanks <Files "...