Subdirectory not found

Don't know if it's the right project, but I was looking for some support.
I am using Drupal 6.22 with a multisite installation, on a windows 2003 server with Apache and https sites.

I'm trying to install a test server with (almost) the same databases and structure as my production server.
So I can test new modules etc. without having to change all sort of things.

One thing I have to change of course is my subdomains names.
I changed *.mysite.com in *accept.mysite.com .
Then I have to change my apache conf files (httpd, vhosts and ssl), change my hosts file (resolve the new subdomains), create self signed certificates, and change the settings.php files in the Drupal (sub)domain directories.

So far so good. All changes seem to be correct: https://wwwaccept.mysite.com works fine.
But only the settings.php of the default directory is found, for instance: sub1accept.mysite.com and sub2accept.mysite.com also use the default settings.php file (and the wrong database...).
When I change the directory /sites/sub1.mysite.com into /sites/sub1accept.mysite.com it works!
But I don't want to change the directory because for instance all the links in Drupal point to the sites/sub1.mysite.com directory!
Of course initially the subdomain was installed as sub1, so Drupal recognizes that path, but how and where can I tell Drupal to look for the settings.php file in the subdirectory sites/sub1.mysite.com when I use the url sub1accept.mysite.com ?
Somewhere in a config file??
(Hint?: when I use accept.sub1.mysite.com everything works: Drupal probably removes accept. when trying to find the correct subdirectory....) (but I cannot use that structure in my DNS )-:)