I went to the "ME" folder, I openned file called MEInit.xml and found this
<Plane Name="MiG-23MLD" WorldID="1" Shape="mig-23" CLSID="{A00E562B-1DC8-4671-9EBF-C1CDC2506AE7}" HumanCockpit="no" EmptyWeight="10550" MaxTakeOffWeight="17800" MaxFuelWeight="3800" WingSpan="14" MaxHeight="18500" MaxSpeed="2494.8" Cannon="yes" Rate="30">
And I changed HumanCockpit="No" to Yes but the MiG 23 doesn't appear in the list of flyable airplanes (can't set "Player" in skills)
ps. I have Lock On Air combat simulation 1.02 :(