Finally the proof that it is the one mystic unicode character:
$ mv ARTE_Concert_-_Jazz-Avishai_Cohen__Au_Gr?s_du_Jazz-1734575236.mp4 ARTE_Concert_-_Jazz-Avishai_Cohen__Au_Grs_du_Jazz-1734575236.mp4 $ find . -name "*4" ./ARTE_Concert_-_Jazz-Avishai_Cohen__Au_Grs_du_Jazz-1734575236.mp4
Finally the proof that it is the one mystic unicode character:
$ mv ARTE_Concert_ -_Jazz- Avishai_ Cohen__ Au_Gr?s_ du_Jazz- 1734575236. mp4 ARTE_Concert_ -_Jazz- Avishai_ Cohen__ Au_Grs_ du_Jazz- 1734575236. mp4 Concert_ -_Jazz- Avishai_ Cohen__ Au_Grs_ du_Jazz- 1734575236. mp4
$ find . -name "*4"
./ARTE_