ftp_get doesn't work with accented characters

Question

I'm using ftp_get to get files from ftp servers in my php script it works except when filename contains accented characters. Exemple: ftp_get($conn_id,"tmpfile", "matériel.xlsx")

I tried :

ftp_get($conn_id,"tmpfile", urlencode("matériel.xlsx"))
ftp_get($conn_id,"tmpfile", utf8_encode("matériel.xlsx"))
ftp_get($conn_id,"tmpfile", utf8_decode("matériel.xlsx"))

Nothing works