Apache With PHP4 On Windows

I'm trying to add a PHP4 module (php4apache.dll) to my Apache installation on Windows.

I have apache installed in c:\apache
and PHP4 in c:\php

However, when I add the lines to httpd.conf which LoadModule, AddModule for php4apache.dll and php4apache.c, then I put in the lines to map .php files to the PHP scripting engine (php.exe)...

Something, somewhere, is going wrong, because when I open an internet explorer window directed at 10.0.0.1 (the IP of the machine with Apache on) and tell it to look for phpinfo.php, the contents of which are

<?php
phpinfo();
?>

then that is exactly what is displayed on the web browser... It does not get processed by PHP, it just sends the entire text, as it is in the original file...

Any ideas or suggestions anyone?

By the way, I also tried installing PHP4 into my apache installation on Linux Mandrake, but I didn't get very far!