Hai radar contact fansI had a problem with the fact that RC calls KLM Cityhopper >>> city of ireland. I changed the atc name in cfg file from woai. (Also checkt Fsuipc settingd ) And the labels in Fs9 now show KLM instead of city with the hoppers, so that is great.... I saw on various forums such asthis http://forum.avsim.net/topic/98490-some-problems-callsignsheavy-call/That with some modifications of the rcv4datac4.csv file you easily fix the problem....I did that but I get the system error message ..And yes I am so stupid and impatient and did not made a back up csv file.(stupid stupid i Know)It is now in my c4.csv like thisKLM, KLM, KLM Royal Dutch Airlines - Netherlands, 0, 0KLM Cityhopper, KLM Cityhopper, KLM Cityhopper, 0.0Knee Lake, Knee Lake, Knee Lake, 0, 0Someone who knows how I can change it so that rc work again ..???OR maybe send my an rc c4 cvs file......Your help is wanted thanksgr Eric