Many thanks for all the info.
I took a look at those downloads, and I must say that they're both rather strange. The one at ModDB seems to be the original retail version, but packaged with a native Windows executable (dated to 2001) and so far, I haven't been able to get it to run on Windows 7 at all, unfortunately.
At Abandonia, the content of the archive is the DOS release, but apparently, it's an older version that doesn't have any music (even the setup is missing the option for midi support). Odd.
Tannath: Drascula: The Vampire Strikes Back
This doesn't have anything to do with the topic, but Drascula always struck me as a really, really weird game.