Well, well. I played around with the export of MP3Tag the last few days, choked Google for a complete solution, but I'm still stranded.
I "just" need a playlist for unicoded MP3s. That was quite simply done with this MTE:
$filename(m3u8,utf-8)#EXTM3U #EXTART:%artist% #EXTALB:%album% $loop(%track%)#EXTINF:%_length_seconds%,%artist% - %title% %_filename_ext% $loopend()
This is more or less the UTF-8 version of the playlist MP3Tag writes as M3U, that one would be exactly
$filename(m3u)#EXTM3U $loop(%track%)#EXTINF:%_length_seconds%,%artist% - %title% %_filename_ext% $loopend()
Right so far? At least it looks like it generates the same M3Us as MP3Tag and the UTF-8 export works fine within Winamp and Foobar, but Windows Media Player does not recognise M3U8 at all.
BTW, I couldn't find any really useful information about the M3U8 format, just the regular stuff about M3U from Winamp. OK, M3U8 is M3U with UTF-8, but what about the header #EXTM3U? Do I have to write #EXTM3U8 instead or is this obsolete now?
And is there any unicoded playlist I could export to, that works with at least the most important players on any platform?