Open files of type *.abc with Unity App

Hello,

I am wondering if there is a way to do the following: I would like to double click a file on my desktop, which I have associated with ".abc" and have the OS open my unity app and get the location of said file.

I currently have it working on Windows, using Open With... and navigating to the .exe. I then use
System.Environment.GetCommandLineArgs() in Unity, which sees two arguments, my app and the path to the file. Is there any way to do this on OSX? I am able to open the app by clicking on the custom file type, but it only has one argument (the path to the Unity application). I don't NEED to use command line arguments either, if there was any other way to get the file location.

I've seen these:
https://apple.stackexchange.com/que...x-recognize-new-file-extensions#answer-175395
https://answers.unity.com/questions/545983/how-can-i-open-a-file-from-the-finder-in-my-os-x-u.html
but hoping there was an easier way.

Cheers,
- Rob