Drag-and-drop between RDP client and Teriminal server

We have a VB.NET desktop WinForms app that runs on the Windows Server 2008 R2 in the RemoteApp (http://technet.microsoft.com/en-us/library/cc755055.aspx) Remote Desktop Services mode. Currently users cannot drag-and-drop a file from users local PC desktop into the RemoteApp.

I know this is not supported by default. Are there any APIs available to facilitate such a drag-and-drop of a file between the RemoteApp and the users local PC drive (desktop or other folders)?