After months I've finally understood why from version 1.00 on my old bsi files lack on linking audio to the movie:
there is a little bug in bsi parsing that forget to chain "Directory" value in [Movie] section with the "AudioFilex" value.
Maybe an example will explain it better:
...
[Movie]
...
Directory=.\Movie
...
AudioFile1=eng_track.mp3
tries to load .\eng_track.mp3 instead of intended .\movie\eng_track.mp3 :?
:idea: the workaround (until some fix) is to write
...
[Movie]
...
Directory=.\Movie
...
AudioFile1=.\Movie\eng_track.mp3
Now I'm happy to upgrade to version 1.00
I hope that this will help someone...
Bye.