Alternate dashes in title

Sometimes I have a title that contains what is called an en dash (–), or an em dash (—). These are longer-than-usual dashes (https://en.wikipedia.org/wiki/Dash). However, MP3Tag does not seem to support these. When I save the file, those characters revert back to a regular dash. Is there a way to get these in a title (or album name) without resorting to a hex editor?

With which character encoding do you save the data?
It works with UTF-16, it does not work with ISO-8859-1

That did it! Thank you.