This Daisenryaku II - Campaign Version supplement offers Xak vs Cloud campaign game that you can command Xak characters or Major Cloud's modern weapons, adds new maps and units such as birds/robots, and edits weapon stats and graphics and converts the graphics to Graph Saurus/DD Club format.
Daisenryaku II - Campaign Version and several blank disks are additionally necessary.
"Customer" was likely named so by being mistaken with Customizer since this software customizes Daisenryaku II. This software was not released on any other platform that Daisenryaku II was released.