Read link between to milestones in two separate ms-project files

Greetings,

I have write an addIn in Visual Studio (Visual Basic) for MS-Project 2010 and 2013.

Now I search VB Code to read out a text-link from one ms-project file (milestone A / start date) to another ms-project file (milestone B / start date ).

Have any a sample code for me?

Thank you!

   Michael