private static void PrepareIni(string carId, string carSkinId, string showroomId) {
var filename = FileUtils.GetCfgShowroomFilename();
var iniFile = new IniFile(filename);
iniFile["SHOWROOM"].Set("CAR", (carId ?? "").ToLowerInvariant());
iniFile["SHOWROOM"].Set("SKIN", (carSkinId ?? "").ToLowerInvariant());
iniFile["SHOWROOM"].Set("TRACK", (showroomId ?? "").ToLowerInvariant());
iniFile.Save();
}