Win 10 'Open with' Opens as 'External'

Hi folks, I’m new to this so please bear with me.

My preferred method of opening an image with Gigapixel AI, DeNoise AI, and Sharpen AI is to right click over the file and use ‘Open with’. It took me ages to figure out that opening the apps in this method opens them as external editors, I’d actually figured that these apps were by nature destructive… which is all kinds of wrong.

I’ve used these as plugins for the Skylum software which have an Export option even when I use ‘Open with’ so I was shocked that these don’t open as stand alone using that method.

So my question is: Is this a bug or is it expected behavior? And if it’s expected behavior why? What am I not understanding?