it is not the good command, youy have to copy your file to QNTC disk system, not QDLS disk system;
use CPYTOSTMF to copy to QNTC
look at http://www.iseriesnetwork.com/Forums/Index.cfm?CFApp=55&Message_ID=113086
To copy a streamfile from the IFS to a share on a Windows system, use they CPY command. To copy an externally described database file, use CPYTOIMPF. To copy a source file member or program-described file, use CPYTOSTMF.
CPYTOPCD is an obsolete special-purpose command. It’s almost certain you will never have a use for it. If you think you do, assume that you haven’t found what you need and keep looking.