Music and Mp3 Player as well as Playlist Editor didn't work.
Here is what i've done.
1) I downloaded ESF B1.2 Full installer.
2) I installed Half-Life.
3) I updated Half-Life to 126.96.36.199
4) I installed ESF B1.2 (Full, with MP3s, japanese voices)
5) I played esf (but there was no music...