How to make Notepad++ open each file in new window

There is -multiInst launch parameter that lets you open more than one instance of Notepad++, but how to make it launch a new window every time when I click on "Edit with Notepad++" or "Open With…" shell context menu?

create a totally empty file called 'asNotepad.xml' and put it in the Notepad++ directory at the same level as the notepad++.exe file