Disable folder drag and drop in Thunderbird

An RDP session is not a valid Drag source in Windows (yet?), so copy and paste is the fastest way.

I usually hit ctrl-c and ctrl-v for copy and paste anyway, as personally I find it quicker than drag and drop, plus you don't get stuck waiting for imaginary transfers like when you copy something and then hit right-click to try and paste it between sessions.

Copying and pasting in and out of RDP is slower (transfer time-wise) than copying via a (VPN) share or FTP or HTTP, so I'll usually use one of those for large files, which keeps my cut & paste available for other tasks while it's copying.

Create a Windows Explorer shortcut (In Explorer right click -> new -> shortcut). Then right-click on your shortcut and open the Properties dialog box. In the Target field enter something like this:

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -noexit -noprofile -file C:\yourscriptdirectory\yourscript.ps1

Whether you need the -noexit or -noprofile options is up to you, take a look at the help to decide.

Now when you drop a file (or folder) onto this shortcut, explorer will magically pass it as the first argument to your script.