I am working on a plugin on an Apache centos cPanel server.

I have created a file /wp-content/plugin/includes/license.php and when I try and access it via an ajax call or even directly via example.com/wp-content/plugin/includes/license.php I get error 404.

If I do nothing else apart from rename the file to a.php, the file is loaded as expected.

Is license some sort of reserved word or is this caused by a directive in .htaccess or what?