How can I drag files from Explorer to Liquid XML Studio?

Liquid Studio 2017 and newer
Liquid Studio 2017 allows you to drag and drop files from Windows Explorer onto any surface including open documents.
Liquid XML Studio 2016 and older
Dragging multiple files from Windows Explorer is valid but you must drop them on either the Start Page or the Title Bar section of Liquid XML Studio. You cannot drop them onto already open documents.