That’s about the only time I don’t like being Danish! Despite Navision being Danish, then NAV really don’t like our three extra letters. Especially the Ø used to cause troubles.
But I can see that you’re using BigTexts. Have you tried using a stream instead? Here you are able to specify the TEXTENCODING directly.
https://msdn.microsoft.com/en-us/library/dn271702(v=nav.80).aspx
Last time I had to get it to work directly, it also took me hours to get right… [:(]