How php in ISAPI mode?

["news.php.net" <javalpi@xxxxxxxxx>]

Hello,

I am trying to install PHP in ISAPI mode and no in CGI mode.

Some time ago I intalled PHP 4.4.3 on a W2000 IIS 5.0 in ISAPI mode 
without any problem but now I wonder if it was only luck :(
I followed instructions about cgi.force_redirect=0 in php.ini and using 
the IIS manager I added php4isapi.dll in filters and for extension .php.
I thought these steps allowed PHP to work as ISAPI module.

Now I deal with PHP 4.4.7 on a W2003 IIS 6.0. I have checked 
cgi.force_redirect, filters and extension .php but the browser gives a 
404 error for any php request.
I have found using phpinfo() that the main diference between this 
installation and the correct one is that on W2003 PHP is in CGI mode and 
I guess that if it was in ISAPI mode it wouldn't give the 404 error.

¿What I must check to configure it in ISAPI mode?

Thanks.