PrecisionSim A320 question

Hi folks,i downloaded initial FS2002 release, both version IAE and CFM, of IADG A320 (you know, the package with Condor and Aero Lloyd liveries).In that package model.IAE was coupled with A320_2k2v4.6.air and model.CFM with A320_2k2v4.6n.air.Today i downloaded two new A320 from precision.sim site; both (MEA and Spanair) were IAE but i do not know why .air file is A320_2k2v4.6n instead of A320_2k2v4.6.Can anyone please explain what does this means?My intention is simply to add the two texture packages and create two new liveries adding respective entries in aircraft.cfg.Thanks in advanceLuigi ;-)