How to access a file made by BinaryFormatter

I'm a beginner Unity learner, and want to open a file I saved by BinaryFormatter, following this lecture. https://unity3d.com/jp/learn/tutorials/topics/scripting/persistence-saving-and-loading-data

I understand BinaryFormatter serializes so users can't access it. But I want to be able to open and check the file I save in Play mode. Data I'm saving is only integers.

Is there any way I can save to a file and be able to access from other program, like notepad?

Thank you.