Please note when asking questions, that it is best to create your own new post as opposed to tagging your question to the end of someone else's post.
Assuming that you are running Knoppix 3.8.x
A Google search for: DOS program run on linux. One of the links is to DOSBox - A DOS Emulator http://users.netwit.net.au/~pursang/dosbox.html. So then I go to http://packages.debian.org and search for DOSbox under ANY and I discover that it is in debian. So to install DOSBox on Knoppix 3.8.x (assuming the network is properly configured & the machine can access the internet) is as simple running two commands:
apt-get update
apt-get install dosbox
The total download size is about 10MB.

I hope this helps.
James