Useful Generic data serializer and loader

DataController.cs

using System.IO;
using UnityEngine;
using System.Runtime.Serialization.Formatters.Binary;
using System;
using System.Collections.Generic;

/// <summary>
/// Quick tip: Don't use the '.' inside fileExt parameters (i.e. correct: 'exe' | incorrect: '.exe')
/// </summary>
public class DataController
{
    public static void BinnarySave<T>(T objectToSave, string fileName, string fileExt, string folderPath = "/")
    {
        try
        {
            BinaryFormatter bf = new BinaryFormatter();
            string path = Application.persistentDataPath + folderPath + fileName + "." + fileExt;
            FileStream fs = new FileStream(path, FileMode.Create);
            bf.Serialize(fs, objectToSave);
            fs.Close();
        }

        catch (Exception err)
        {
            Debug.LogWarning("Serialization error was occurred! " + err);
        }
    }

    public static T BinnaryLoad<T>(string fileName, string fileExt, string folderPath = "/")
    {
        string path = Application.persistentDataPath + folderPath + fileName + "." + fileExt;
        if (File.Exists(path))
        {
            BinaryFormatter bf = new BinaryFormatter();
            FileStream fs = new FileStream(path, FileMode.Open);

            T data = (T)Convert.ChangeType(bf.Deserialize(fs), typeof(T));
            return data;
        }
        else
        {
            return default;
        }
    }

    public static List<T> BinnaryListLoad<T>(string fileExt, string folder = "/")
    {
        List<T> grabbed = new List<T>();
        string[] filePaths = Directory.GetFiles(Application.persistentDataPath + folder, "*." + fileExt);
        foreach (string path in filePaths)
        {
            if (File.Exists(path))
            {
                BinaryFormatter bf = new BinaryFormatter();
                FileStream fs = new FileStream(path, FileMode.Open);

                T data = (T)Convert.ChangeType(bf.Deserialize(fs), typeof(T));

                grabbed.Add(data);
            }
        }

        return grabbed;
    }

    public static void RemoveFile(string fileName, string fileExt, string folder = "/", Action callback = null)
    {
        string path = Application.persistentDataPath + folder + fileName + "." + fileExt;
        if (File.Exists(path))
        {
            File.Delete(path);
            if (!File.Exists(path) && callback != null)
                callback();
        }
    }

    public static void CreateDir(string name)
    {
        Directory.CreateDirectory(Application.persistentDataPath + name);
    }

    public static bool FileExist(string fileName, string fileExt, string folder = "/")
    {
        string path = Application.persistentDataPath + folder + fileName + "." + fileExt;
        return File.Exists(path);
    }


    public static void JsonSave<T>(T classSaver, string fileName, string fileExt)
    {
        string json = JsonUtility.ToJson(classSaver);
        File.WriteAllText(Application.persistentDataPath + "/" + fileName + "." + fileExt, json);
    }

    public static T JsonLoad<T>(string fileName, string fileExt)
    {
        string json = File.ReadAllText(Application.persistentDataPath + "/" + fileName + "." + fileExt);
        return JsonUtility.FromJson<T>(json);
    }
}

Revision #2:
-Removed debug in BinarySave
-Added new 'FileExists' function