/ENCODING=type

    This qualifier controls the type of encoding used to encode the
    input file. The possible values for this qualifier are BASE64,
    CBASE64 (gzip compressed BASE64), BASE85, BINHEX (encoding only,
    not the file format), BTOA, HEXADECIMAL, PATHWORKS, QUOTED_
    PRINTABLE, UUENCODE, CUUENCODE (gzip compressed UUENCODE). BASE64
    encoding is the default; this is also the default decoding type
    used by DECODE.