User manual: Intro - Server Packages - Bot Library manager - Options window - Datafile creator
Use this window to set the paths to the files this program uses. UT System Config supports replacement INI files for both the system and user configuration (usually UnrealTournament.ini and User.ini). Optionally, you can set it up to ask you which file to use whenever one is required - unless you need to, don't enable this feature, as it quickly becomes annoying.