After exporting the address data I edited it and tried to import it into the system once more. This was not successful. What\'s the cause of the problem?

The export file should not be edited with a standard editor, such as \"Windows Notepad\", as this may make the file unreadable for MyDPD Pro. We recommend \"WordPad\" or other subsequently installable editors, such as: \"Notepad++\". \"Excel\" or other spreadsheet programmes can also be used.