I used raine because my old version of mess doesn't play audio wav file with loop. I'll try your version.
I've found my I/O error, it's because I forgot to put the demo2.spr in my iso.
It's seem to work; I'll test with other assets .Thanks HPMAN, you saw it before me ;-)
So now, I'll need to find how the BIOS calls BIOSF_LOADFILE ($C00552) "https://wiki.neogeodev.org/index.php?title=Loading_files" to try to load files in game as I'm using C with Datlib.