Apachee and dll files

Hello to all
I need some help configuring Apache to accept dll files as the default file
for a specific site.
I am running version 2,x (sorry I don't remember the rest off hand) on a
Windows NT 4 sp6 server. Our mail server (mDaemon 6,8,5) has a web mail
service but the whole thing is in a dll file. I made the alias command
(ALIAS /mail "C:\MDAEMON\WC") and a directory entry, I also added the dll's
name to the DirectoryIndex but when I enter the url www.dimioan.gr/mail I
get prompted to download the dll
How do I go by configuring the server to think the dll is like a htm file
for that url

TIA
Polihronis

hmmz not sure apache can serv from a dll,
but what if you set the webmail to use prot 81 or somthing and
redirect /mail to http://yourserver:81 ?