I'm not sure I completely understand what exactly is the problem here. In Rebex FTP, there is FtpItem object and FtpList object (a collection of FtpItem objects). In Rebex SFTP, there is SftpItem and SftpItemCollection (a collection of SftpItem objects. FtpItem is very similar to SftpItem and FtpList is very similar to SftpItemCollection.

To check whether an item is a file or directory, you can either use IsFile and IsDirectory properties or the Type property. Example:

        Sftp sftp = new Sftp();
        sftp.Connect("server01", 22);
        sftp.Login("tester01", "password");

        SftpItemCollection list = sftp.GetList();
        foreach (SftpItem item in list)
        {
            // display last modification date    
            Console.Write(item.Modified.ToString("u"));

            // display item type (usually a directory or file)
            Console.Write(item.Type.ToString().PadLeft(16, ' '));

            // display item size
            Console.Write(item.Size.ToString().PadLeft(10, ' '));

            // display item name
            Console.Write(" {0}", item.Name);
            Console.WriteLine();
        }