that looks like the entries on the list of buildings in a map, used to dictate building coords, owner, etc
the secret lab stuff is in rulesmd.ini under the [General] header. the vanilla entries are
SecretInfantry=SNIPE,TERROR,DESO,YURI
SecretUnits=TNKD,TTNK,DTRUCK
SecretBuildings=GTGCAN
which means the game will pick one of these techtypes at random to give to the player upon capturing it. being a rules.ini entry, it is of course possible to add and edit these entries in the mapside ini