PHP Configuration Setting for 404 Errors

Our PHP installation is intercepting 404 Page Not Found errors and displaying this basic and generic 404 error message on pages with the .php extension:

File not found.

It is preventing the requestor from seeing our nicely formatted ERROR 404 Page.

How do I shut off the PHP setting to have the server use our Apache directives for 404's?

Here is a screenshot of the nicely formatted 404.

Here is a screenshot of the 404 that does not the follow Apache Directives.