I still work with an IBM Mainframe and an AS/400 extensively. Since both support FTP several years ago I went looking for an FTP client that understood how to read their file structures. I found BlueZone FTP from BrotherSoft. It works great, for M/F, AS/400 and all other system types. It even has a secure version. The only issue has been they renamed it from BlueZone to SeaGull and back again, as the company was bought out I think. But it is still a wonderful product by any name.