Doubleclick on files to open in Max-Application

Hi,

I created an Application in Max under Windows and there I assigned the File-Extension to the Application-Exe.
What I would like to achieve is to invoke any kind of ‘Open’ – Command if this trigger is sent by Windows to the application. With Macintosh I will have the same problem, but the only thing I have to find out is what is triggered when opening an assigned file.
So far I totally cleared the maxinterface.json file inside my applications support-folder so it looks like this:

{ "interface" : {
	"commands" : [

		{
			"message" : "maxwindow",
			"label" : "Max Window",
			"target" : "max",
			"shortcut" : "M"
		}

		],

	"menus" : [

		],

	"menubar" : { 

	},

	"toolbars" : [
		{
			"id" : "maxwindow",
			"commands" : [ "maxclearall", " ", "sortbytime", " ", "dialog", " ", "reveal" ]
		}
	]

}}

This is helpful because I can redesign my app-menu from inside with the menubar-Object.
But… I dont know if this is the right way to go?!

If anyone can help it would really help me a lot!

Best,
Johannes