You should really read that thread posted above. You will have to mount a folder in the dosbox-0.73.conf file.

in my case, its on my media card:
mount c /media/mmc/dos

then you would want to load the rover.sys file for your keyboard layout:
keyb rover.sys us

you place your setup files in that mounted folder. If you're getting a ~ in the filename, try editing the name of the file to be shorter.

that should get you started.