When you imported a CSV file, which contains special characters in the names like ö, ü, ... to the external user directory of the application it could be that those special characters are imported in a wrong way.
This can be solved by saving the csv file in UTF-8 encoding instead of ANSI.
Open the CSV file in notepad (not notepad++) and save it again. Select when saving UTF-8 as encoding and then import the file in the application suite. Now all characters will be shown ok.