added extra check that input is a mech file before attempting to read the text
added extra check that input is a mech file before attempting to read the text

asoplata/DynaSim,asoplata/DynaSim,kupiqu/DynaSim,DynaSim/DynaSim,asoplata/DynaSim,asoplata/DynaSim,kupiqu/DynaSim,DynaSim/DynaSim,kupiqu/DynaSim,asoplata/DynaSim,DynaSim/DynaSim,kupiqu/DynaSim,DynaSim/DynaSim,DynaSim/DynaSim