[command-line] Always open in the same edit window?

[trump]

`xnviewmp.exe <image_filename>` could load a file in edit mode. It keeps opening a new window/tab. Is that possible to make it open in the same window, without touching "allow only one instance" and "tab max number".

I am thinking about using a script to push a file to show in xnview via command-line. or is there any way to message xnview?

[xnview]

if you have not 'one instance', you can't