[Scorn]

I've just discovered a CD containing a full version of the old game MILLENIA.
Great!

DosBox:
mount c c:\ (yes i know, sorry)
mound d d:\ -t cdrom

But when I start the game it tells me this:

Searching For CD-ROM ...
Unable to locate CD-ROM with Millenia on it. Make sure that
the disc has been inserted into your CD-ROM drive.

So ... hm what?
The disc is running quite well; I tried to create an ISO and get it work this way.
Same result.
I tried to run the game from the CD.
Same result.
So ... what? Who can help?