So here we go.. a quick recorded version.
Since Unity doesn't really have an elegant solution to a 'user file open dialog' I've decided to go to a more source file update type method.
So basically there's a file in the directory with the application called 'gameSource.txt' and the app with automatically load and refresh the scene with this map data when the file is changed. So if you have a simulation output the results into this text file the visualizer will automatically load the file and play the new simulation.
Why is this good? Because it means you don't have to restart the visualizer it can stay open the whole time playing while you work away and will update when there's new game data.