WordPress MU

I create a file with this :
<?php
require_once('/www/test/wpmu/wordpress-mu-1.2.3/wp-config.php');
?>

if I name it foobar.js.php, it does not redirect : http://yadan.net/firestats-dev/foobar.js.php

if I name it firestats.js.php it does: http://yadan.net/firestats-dev/firestats.js.php

this is driving me nuts. any idea wtf?

I managed to work around this:
it appears that the problem only appears when running wpmu in blog=directory mode (unlike blog = vhost).

regardless, its a nasty bug and I would like to get some response to this.

Without having access to your log and error files and the php files up there, there's little we can help with.

the problem is reproducible:
I will gladly provide any information required.
in any case, I think there is enough information to reproduce the problem in my messages.

I hang around #wpmu at freenode, I have no problem debuging it with someone who knows the wpmu redirection code logic.