Your file was not corrupted, this is what you get if you make a change in the model.cfg, located in the official/onestore/asobo-aircraft-(egt c172sp-classic)/simobjects/airplanes/(asobo_c172_classic)/model
You turned off show internal view and ; out external.xml, or ; out internal.xml or both it would not show one or rhe other or both ; of the xml files out show no plane at all.
But this is also interesting for cockpit builder.