Archive pages with .php extension … possible?

Hi,

I would like to know if it’s possible to have archives pages (category or by date) to publish with a .php extension.

The reason is simple: I want to include their content in other pages and including them like this works:

<?php include (‘http://www.natural-clothing.com/content/2006/02/27/new-affiliate-discount.php&#8217;); ?>

while including them like this:

<?php include (‘http://natural-clothing.com/content/?cat=5&#8217;); ?>

or this:

<?php include (‘http://www.natural-clothing.com/content/category/Static-about-pages&#8217;); ?>

does not!

I’m not sufficiently good at programming to know why, but I guess the fact that I nclude a page with an extension makes the include read the page differently.

You can see the tests with the above includes here, of course only the first one one works:

http://www.natural-clothing.com/test.php
http://www.natural-clothing.com/test2.php
http://www.natural-clothing.com/test3.php

Thanks for any tips on how I can either create my archive pages with a .php extension or how I can publish the content of an archive page through a php include and actually make it display!

Thanks very much!

Chris