Writing binary files on Android

I have this code snippet to save/load class objects into/from binary files. It works perfectly on Windows:

 public static void SaveFile(string filename, System.Object obj)
 {
     try
     {
         filename = Application.dataPath + @"\Resources\SaveLoad\" + filename;
         Stream fileStream = File.Open(filename, FileMode.Create, FileAccess.Write);
         BinaryFormatter formatter = new BinaryFormatter();
         formatter.Serialize(fileStream, obj);
         fileStream.Close();
     } 
     catch (Exception e)
     {
         Debug.LogWarning("Save.SaveFile(): Failed to serialize object to a file " + filename + " (Reason: " + e.Message + ")");
     }
 }
 
 public static System.Object LoadFile(string filename)
 {
     try
     {
         filename = Application.dataPath + @"\Resources\SaveLoad\" + filename;
         Stream fileStream = File.Open(filename, FileMode.Open, FileAccess.Read);
         BinaryFormatter formatter = new BinaryFormatter();
         System.Object obj = formatter.Deserialize(fileStream);
         fileStream.Close();
         return obj;
     } 
     catch (Exception e)
     {
         Debug.LogWarning("SaveLoad.LoadFile(): Failed to deserialize a file " + filename + " (Reason: " + e.Message + ")");
         return null;
     }       
 }

What modifications have I to do to make it save/load properly on Android? And hopefully on all other mobile platforms as well.