It works YEAH!!!
I used VLC to convert my mp3-files into ogg-files.
You have to use this Setting:
Vorbis audio
44100Hz
192 bit
2-channels (for Stereo)
and then convert it to an ogg-file.
Save it under Users\...\documents\1C SoftClub\il-1 sturmovik cliffs of dover\music\
Start you game and "Aces High"
