Sorry I forgot to include that file ... my dmv.bat is somewhat more elaborate

mess -window dmv -slot1 k208 -slot3 k806 -slot4 c3282 -slot5 k803 -slot7 k234 -slot7a k235 -hard1 "\mame\media1\ncr\ncr dmv\Harddisk Images\615-4-17_ncrdmv.chd"
Edit this line for the name of your MAME/MESS executable and disk image location.