First hello all, DOS box works very good for me. i need a little help from the professionals, i have the old game Rex Nebular on floppy, i copied all the floppys to a folder E:\rex i mount E:\rex with dosbox when i click INSTALL it says Please insert disk in drive A:\ and press enter.

Is there a way to mount E:\rex as drive B:\

in the install i get the option of source A:\ or B:\

Thanks