m4a - unicode

Mp3s with Polish letters display properly but it does not work with my m4a files from iTunes.
I guess this might be same case for other languages.
Polish letters:
ą ć ę ł ń ó ś ź ż
For testing I changed names of both mp3 and m4a files:

MP3:

M4A:

I guess this might be same case for other languages.
Polish letters:
ą ć ę ł ń ó ś ź ż
For testing I changed names of both mp3 and m4a files:

MP3:

M4A:
