A family of Microsoft relational database management systems designed for ease of use.
Good question, the answer is I didn't set it in the Runtime because you can't.
I assumed that the DB ( I know it is not best practice, trust me I do, but I didn't create it I inherited it) which is not an accdb but an actual copy of the full mdb should therefore take the settings from the server version of the DB which is copied to the clients. The server does have a full copy of Access and that is where I set the option.
Given that logic I assume the question becomes: if it is a client setting on the local machine and Runtime obviously can't set it where is it set and how and why does it work for some not others.