All we basically do is to write the contents of the form field to a file.
I already tried FileWrite() with different encodings (i.e. ISO-8859-1, UTF-8 and several others, as well as no encoding at all (which should be the same as ISO-8859-1)).
Of course theoretically the problem could have been in the way this file is read. That's why I installed a hex-editor to make sure this is not the case.