We’ve used smbclient on AIX for bidirectional PC-based file transfers for several years, and have found it relatively easy to use. It eliminates the need to have an FTP server set up on the PC. We primarily use smbclient in ksh scripts for scheduled batch file transfers.
You just need to get the PC server administrator to set up a login/password for smbclient to use and have the appropriate read/write/delete access set up on the PC for that login.
See the AIX manpage ‘man smbclient’ for details.
-Glenn