For my site I have a RewriteRule that points the URL http://www.mysite.com/work to a work.php file. I also have a directory called \"work\" that has files in it, like project1.p
This is the answer to your question. It works for me.
RewriteEngine On RewriteBase / RewriteRule ^([a-z]+)$ $1.php [L]
Simply remove beta/
beta/