I’m having the same problem and don’t have any odd symbols in my mp3 names. Any ideas?
my server directory is: https://www.mindreadersdictionary.com/dictionary/files/simplesorry.mp3
And when I get the error opening files message and try to download it is trying to retreive the file from: https://www.mindreadersdictionary.com/blog/podpress_trac/web/601/0/simplesorry.mp3