Game System files are specific to the rules for a gaming system, such as 3e, Unisystem, D6, etc. These files define what rules apply for that system, such as Hit Points, vs Vitality Points, Armor Class vs Damage Reduction, etc.
Each Game Mode consists of the following files:
bio/biosettings.lst *
bio/locations.lst *
bio/traits.lst *
equipicons.lst *
equipmentslots.lst
level.lst
load.lst
migration.lst
miscinfo.lst
pointbuymethods_system.lst *
rules.lst
sizeAdjustment.lst *
statsandchecks.lst
tips.txt *