Dragging From WinRar to FileZilla works fine, so maybe there IS a solution.
Basicaly WinRAR can drop files to Windows Explorer only.
So there's no solution.
I often want to drag & drop files directly from an archive with WinRAR and the plus icon is displayed in the WinSCP window but when I release the mouse button nothing happens. So I always have tounpack the archive to a local directory and after that I can upload it. Can this problem be solved?