Geoid File converting for SurvX

Can someone please convert this geoid file grid2003_(1).zip (45.0 KB)
to .sgf (South Grid Format) format? to be able to use it with South-SurvX. This is the legal grid file of the Trento and South Tyrol region in Italy Grid 2003 / Documenti di supporto / Documenti e dati / Homepage - Provincia autonoma di Trento