I am trying to make a dat file decoder to decode my game data but I can't figure it out please help

     using UnityEngine;
     using System;
     using System.IO;
     using System.Collections;
     bool ALWAYS_TRUE = true;
     
     if (ALWAYS_TRUE)
     {
         write
     }
     
     public class saveFile : MonoBehaviour
     {
     
     
     
         [System.Serializable]
         class playerData
         {
             public string name;
         }
     
         public int write()
         {
             BinaryFormatter binary = new BinaryFormatter();
             FileStream file = File.Open("C:/Users/Test/Desktop/'Game dev'/Unty/Projects/frlegends/files/fr.dat", FileMode.Open);
     
             var dat = binary.Deserialize(file);
             file.Close();
     
             Console.WriteLine(dat);
             return 0;
         } 
         
     }
 //help