I am not exactly sure, because I don’t own this application.
Any launcher (in my case nova launcher or apex) can start MS-DOS game/application added in Magic Dosbox collection. When mDosbox starts then reads value of intent with code “intent_msg1”. If value of this intent is not null or not empty then mDosbox looks for game with this ID in collection.xml and starts it (if is founded). Else starts home screen with all games in collection.
Here is how mDosbox reads value of the intent at start.
gameID = getIntent().getStringExtra(“intent_msg1”);
Maybe you can send information written above to author of ARC Browser. This information should be enough for him to help you. Or maybe he needs some specific information what you need to ask me.
Edit : Please let me know if I have to implement something