IIS and PHP how to redirect different requests to one file

Hi!

i have an IIS6 with PHP and would like to redirect all requests to
files
(not existing) like:
/documents/2004/11/04/welcome.html
/documents/friends/girl.html

to one file
/documents/index.php
in which, some variable would hold real request path, to let me
display proper information.

As I'm writing this post, I've found that I could specify my own
error404
handling page to 'documents/index.php' but maybe there is some better
solution?

thanks in advance
Jack