Since 5.14, it is always possible to use drag&drop to move remote files to external applications, while copy is always the default operation.
Please read FAQ:
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!! Wow - this was surprising.
Take WinSCP 5.5.3 (Windows 7)
Open a SFTP or FTP connection.
From remote window drag-and-drop any file(!) or FOLDER(!)
into an open local browser window (like Firefox 29.0.1)
You will see a url in the browser window like
And you will see the content in your local browser.
BUT !!! your remote file or FOLDER!!! is deleted !!!
Found this by drag-and-dropping an SVG-file into browser-window to see the content.