Yes before he was king he told the German ambassador he would abdicate rather than allow war with Germany. He dismissed the old court and filled the new with Nazi's like the Duke of Coburg. He gave so much information that secrets were kept out of the royal boxes. He visited Hitlers holiday home and concentration camps. I found this as well
'Bermejillo reported that the Duke of Windsor blamed “the Jews, the Reds and the Foreign Office for the war”. Windsor added that he would like to put Anthony Eden and other British politicians “up against a wall”. Bermejillo stated that Windsor had already made similar remarks about the Reds and the Jews to him long before he became King in 1936. In another conversation on June 25 1940 Bermejillo reported that Windsor stressed if one bombed England effectively this could bring peace. Bermejillo concluded that the Duke of Windsor seemed very much to hope that this would occur: “He wants peace at any price.” This report went to Franco and was then passed on to the Germans. The bombing of Britain started on 10 July."
The man was a complete traitor, willing to do a deal with Hitler to get his throne back, and if he didn't know Hitler would have killed his brother and nieces he was stupid.