Is the "Parameters" field ignored in the "Configure programs" dialog?

[laurent45654]

I'm on macOS and I'm trying to run an app from XnView MP via the "Configure programs" dialog. I want to pass some argument first, then the name of the file. However, whatever I put in the "Parameters" field is not being passed to the app. All I can see is that the first argument is the image file path, but my own custom argument is not there.

Any idea what might be the issue?

Also is there any documentation for this feature?