(FILES) In this file photo taken on January 19, 2017 Former Volkswagen boss Martin Winterkorn is pictured before taking his seat inside the Bundestag (Lower house of parliament) compound in Berlin, where he faces a grilling by German lawmakers, as accusations grow of top executives at the beleaguered auto giant VW colluding to cover up emissions cheating. - Prosecutors in north German city Braunschweig said on April, 15, 2019 they had charged with fraud former Volkswagen chief executive Martin Winterkorn, and four other managers, over the group's "dieselgate" emissions cheating scandal. (Photo by John MACDOUGALL / AFP)