FTPRDP allows you to transfer files between windows terminal clients and windows terminal servers without the need to open any additional ports or use FTP. It uses the same protocol and your existing TS connection. FTPRDP installs as a server/client component and provides a simple FTP-style interface, that lets you transfer files from the local to the remote side. Additional features include transfer speed settings, drag/drop and optional messaging between terminal clients.
This software is a shareware. You will be able to download and test FTPRDP during a certain period of time, then, if it does what you need, you will have to acquire the full version from FTPRDP publisher. The FTPRDP 4.2 free trial version contains an installer and an uninstaller, and has a size of 800 Kilobytes.
For additional information and support request, please contact directly FTPRDP publisher.

FTPRDP Screenshot