Hello Tepa,
microtuning files are currently not supported. However Gladiator3 comes with several excellent modes, which also work very well when you play live and with all tonalities. Click on 'mircotuning' on the top left.
1) Off = default tuning
2) lively chords = works best with low frequency chords or more detuned sounds
3) silky chords = works well with all kind of chords. It has a silky sound
4) just intonation = heavy pitch correction for clean chords
Best Regards,
Markus