.NET Add-in similar to OpenFileForProgram (side database)?

Microstation Connect Update 16.

Is there a right method or constructor to use if you want to load the dgn file into memory without opening it? I see that DgnDocument has some "Create" methods but they seem to relate to creating a new document, then there's also DgnFile.Create methods which are asking for a DgnDocument to be passed in. Session.Instance.NewDesignFile() actually opens the file and I don't see an override to open it "forprogram" sort of like in the interop.