? in mp3 file name for playlists doesn't work

[simbun]

The ascii question mark is a reserved character in Windows, so if it's not working in Linux then I assume simoncn has applied a standard across all the platforms (I'll give it a go later but I'm not at home at the moment).

EDIT: The rules are here.

Because I use Windows and Linux I too have a common standard, and replace the question mark character with a unicode "equivalent" ？. Having said that, I name my files $discnumber.$tracknumber so I only need to change it for folders if they appear in artist and album titles.