TBMM/TBMM/Configuration.cs

using System.IO;
using Newtonsoft.Json;

namespace TBMM
{
    public class Configuration
    {
        public string GamePath { get; set; }

        public static Configuration Load()
        {
            if (File.Exists("configuration.json"))
                return JsonConvert.DeserializeObject<Configuration>(File.ReadAllText("configuration.json"));
            return new Configuration();
        }

        public void Save()
        {
            File.WriteAllText("configuration.json", JsonConvert.SerializeObject(this));
        }
    }
}