Install PHP with IIS 5/W2K

I installed PHP 4.2.3 using the installer from PHP.net I can send the test.php file to the php.exe, and I get the right html code. However, trying to open the same test.php in IE 6 won't produce anything. The window gets the right title, all html is displayed right, but nothing between <?php ?> is executed. I have tried to change most of the settings in Internet Information Services, the extension .php under configuration is also set to C:\PHP\php.exe, etc... What should I look at next? Thanks, Pascal