When you transfer OpenVMS files to a UNIX system and back again,
    some record attributes might be lost. To preserve all RMS file
    attributes, use the /FDL qualifier (File Definition Language)
    with the GET and PUT commands.

    You might also need to use the SET TYPE command to determine the
    type of file transfer:

    o  Specifying SET TYPE ASCII results in a sequential file with
       variable records. Select this type when transferring ASCII
       text files.

    o  Specifying SET TYPE IMAGE results in a sequential file with
       fixed records of 512 bytes. Select this type when transferring
       non-ASCII files, such as binary files or executable image
       files.

    For example, to transfer an executable image to a remote UNIX
    host, follow these steps:

    1. Specify the IMAGE data type:

       FTP> SET TYPE IMAGE

    2. Transfer the file to the remote host. At the same time, create
       and transfer a secondary file with the file's OpenVMS record
       attributes:

       FTP> PUT/FDL file

    To retrieve the file from a remote UNIX host, follow these steps:

    1. Specify the IMAGE data type:

       FTP> SET TYPE IMAGE

    2. Retrieve the file from the remote host after retrieving and
       using the secondary file containing the file's OpenVMS record
       attributes:

       FTP> GET/FDL file.dat