access to the plugin files

I’m using the sermon-browser plugin and within the plugin’s folder is a sub-folder called sb-includes. In order for the plugin to style the sermons properly, it calls sb-includes/style.php which gets the css from the database.

What gets written on the sermons page is
<link rel=”stylesheet” href=”https://www.mydomain.co.uk/wp-content/plugins/sermon-browser/sb-includes/style.php&#8221; type=”text/css”/>

However the styling is being ignored and the plugin author says it is because my server is blocking the style.php. The url to the style.php is returning a 404 error.

However the file is certainly there.

I’ve tried different permissions on the file and it hasn’t made any difference.

I can access other types of files in the sb-includes folder though. https://www.mydomain.co.uk/wp-content/plugins/sermon-browser/sb-includes/datepicker.css works, and I tried upload a test.htm file to that location and that loads up fine.

It’s just php files that seem to throw up a 404 error.

Can anyone suggest a solution? I’m on a new server so there could be something set up wrong which I need to change – but I don’t know what.