[Defender Pro] Allowing access to specific PHP files

Hi, I use defender to block access to PHP file. This creates the following in our htaccess file:

## WP Defender - Protect PHP Executed ##
<Files *.php>
Require all denied
</Files>
## WP Defender - End ##

However, there is a php file that resides in our plugins directory, as part of a custom plugin we created that needs to be accessed via the url in a browser. How would we allow access to this one file, keeping the rest of the Defender settings in tact?

For argument's sake lets say the file is in wp-content/plugins/custom-plugin/custom-file-to-allow.php