Binary formatter problem

I made a simple save system to save data from a scriptable object:

     public void SaveGame()
     {
         BinaryFormatter formatter = new BinaryFormatter();
         FileStream file = File.Create(SaveFile);
         string data = JsonUtility.ToJson(savedData);
 
         formatter.Serialize(file, data);
         file.Close();
     }

It is working, but there is a problem.

When I open the saved file using Sublime Text I get the correct result: But when I open it with any other text editor, this is what I get: Why doesn't it work with other text editors? And how can I fix this?