Download the RDP extension [http://lars.werner.no/adito-application-advancednativerdpwin32.zip here] Leave it as a .zip file to upload the extension.
=== Credit Due ===
Nearly all of these instructions are taken from [http://lars.werner.no/?p=640 and are the work of Lars Werner]. His website has images as well and may be a better source of instruction. These notes are included here so that this hard-to-come-by information is not lost. If you go there, start on "Step 2."
=== Installing the RDP extension ===
The Adito client can publish software to download and execute.