I config PHP4.0.6 for Apache 1.3.12 for Win32 

: in apache configuation file:

ScriptAlias /php/ "C:/PHP/"
AddType application/x-httpd-php .php
Action application/x-httpd-php "/php/php.exe"

then I test with phpinfo.php file in htdocs directory.

: phpinfo.php : 

<?php phpinfo(); ?>

when I type: http://localhost/phpinfo.php, Browser should show me some information table but It show me the original code.

<?php phpinfo(); ?>