uff, my original cd rom ripped to iso works flawless and without problems [of course without files=20].
btw. Maybe try to add line in 01.bat SET FILES=20 /im not sure will it work in dosbox/ 
		
		
	 
I'll start with... this is the GOG version.  So I can only imagine what modifications they made to get it to work for windows XP/7/8.  That said, the exact same program works under Dosbox with DboxFE. 
Regardless, it's asking for the change to be in config.sys... and having done a bit more research it seems like this might be a compile time option for Dosbox... I'll poke at this a bit more.  I had just been curious to see how much better this worked under your version since so many other games are *much* better in Experimental Mode.
Thanks for the reply.  I'll probably look into this a bit more before giving up for the time being... and if I find a .conf/.bat solution I'll post it here.