What does the documentation say?
What does the documentation day? Did you check the FAQ and manual pages on the DOSBox website? I'm assuming you know for certain that the program in question works with DOSBox of course.
Instead of running to us every time you run into a problem, it might be faster and easier for you to check things like the DOSBox website FAQ first. There's no telling when, or even if, you'll get an answer here, since I'd wager very few people even know what DOSBox is, let alone how to use it in even the most rudimentary fashion.