After the end of the Civil War, Winzer remained in Spain and moved to Madrid, along with the German diplomatic delegation. When World War II began, he became one of the main contacts for Walter Schellenberg, the German head of intelligence and counterintelligence. As a police "attaché", his duties also included monitoring the German colony residing in Spain. Winzer, for example, always suspected of Delegate of the Ministerio de Propaganda in Madrid Embassy, Josef Hans Lazar, who, despite being of Jewish origin, carried out a major propaganda campaign in Spain in favor of Nazi Germany. Winzer's power also extended to Portugal, even establishing contacts with the police of Salazar's dictatorship. He even hatched a plan to kidnap and/or murder Otto Strasser, a former Nazi who turned against the regime in Portugal. In early 1945 he was still at the embassy in Madrid. After the end of World War II, his whereabouts are unknown. 