Mounting the disc image with IMGMOUNT in DOSBox 0.74, change to the \DKYDATA\ML\MA directory and do a DIR command. Do you see any of the files listed more than once (i.e. duplicates)? Maybe attach a screenshot of that DIR as well.

I do see duplicates of what appears to be all the MOV files, which I did not see when mounting the image under Windows directly. Is this some sort of MSCDEX conflict?

SVN has a fix for associated files that may help. You can get a Windows build of current source here:
http://www.emucr.com/2012/01/dosbox-svn-r3775.html

I guess not all releases have associated files... they are completely absent on my disc, but they're always a possibility with content originating from the Mac OS.

Did you create a disc image? If so, maybe you created it in a different format than me?

i.e. BIN/CUE versus .iso. I'm using the latter. That shouldn't matter but you never know.

EDIT:

And yep, that SVN version appears to have fixed it, the duplicate file listings are gone now and all the movies and sequences play as they should so far.

Thanks a *lot* for your help guys. 😀

Image format won't change the contents of directories. How the disc was originally authored determines the presence or absence of associated files. The associated files are the resource forks from the Mac OS, and I've noticed that PC/Mac hybrid discs (intended to be used on both platforms) tend to have them.

The box I have does say it's a Windows/Mac hybrid, but I was always under the impression that all copies of this game were. Guess not.