[Zope] Preventing files from being viewed by web clients

[Brian]

I have a flash app that accesses .xml files.

The source is viewable and some creative crackers have figured out how to
meld a url together to get vital information from those .xml's.

I need to prevent the web client from directly accessing them.

Is there a directive (such as Apache's) or mechnisim to keep web clients
from accessing yet allow my app access these files?

Somthing like

<FilesMatch \.(?i:gif|jpe?g|xml)$>
   Order allow,deny
   Allow from <some file name>
   Deny from all
   <some other web trick>
</FilesMatch>

in zope.conf or ???

TIA

Brian