Form1.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
using System.Xml.Serialization;
using HL2_Cinematic_Mod_Launcher.Properties;

namespace HL2_Cinematic_Mod_Launcher
{
    public partial class Form1 : Form
    {
        private ToolStripMenuItem _fileToolStripMenuItem;

        public Form1()
        {
            InitializeComponent();
        }

        public void Form1_Load(object sender, EventArgs e)
        {
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var myDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            if (myDir == null) return;
            var gameDir = Path.Combine(myDir, "E:\\Steam Games\\SteamApps\\common\\CM2013");
            var gameExe = Path.Combine(gameDir, "Configurator.EXE");
            var proc1 = new Process
            {
                StartInfo = {FileName = gameExe, WorkingDirectory = gameDir},
                SynchronizingObject = this,
                EnableRaisingEvents = true
            };
            proc1.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var myDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            if (myDir == null) return;
            var gameDir = Path.Combine(myDir, "E:\\Steam Games\\SteamApps\\common\\CM2013");
            var gameExe = Path.Combine(gameDir, "Launcher_EP0.exe");
            var proc2 = new Process
            {
                StartInfo = {FileName = gameExe, WorkingDirectory = gameDir},
                SynchronizingObject = this,
                EnableRaisingEvents = true
            };
            proc2.Start();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            var myDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            if (myDir == null) return;
            var gameDir = Path.Combine(myDir, "E:\\Steam Games\\SteamApps\\common\\CM2013");
            var gameExe = Path.Combine(gameDir, "launcher_EP1.exe");
            var proc3 = new Process
            {
                StartInfo = {FileName = gameExe, WorkingDirectory = gameDir},
                SynchronizingObject = this,
                EnableRaisingEvents = true
            };
            proc3.Start();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            var myDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            if (myDir == null) return;
            var gameDir = Path.Combine(myDir, "E:\\Steam Games\\SteamApps\\common\\CM2013");
            var gameExe = Path.Combine(gameDir, "Launcher_EP2.exe");
            var proc4 = new Process
            {
                StartInfo = {FileName = gameExe, WorkingDirectory = gameDir},
                SynchronizingObject = this,
                EnableRaisingEvents = true
            };
            proc4.Start();
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void button5_Click(object sender, EventArgs e)
        {
            Settings.Default.Reload();
            var folderBrowserDialog = new FolderBrowserDialog();
            var fbd = folderBrowserDialog;
            fbd.Description = @"Please select the HL2 Cinematic Mod installation directory.";
            if (fbd.ShowDialog() == DialogResult.OK)
                MessageBox.Show(fbd.SelectedPath);
        }

        public class Config
        {
            private const string ConfigPath = @"%USERPROFILE%\\HL2 CM Launcher\\config\\config.xml";

            public string ModDirectory { get; set; }

            public static Config Load()
            {
                var serializer = new XmlSerializer(typeof (Config));
                using (var reader = new StreamReader(ConfigPath))
                    return (Config) serializer.Deserialize(reader);
            }

            public void Save()
            {
                var serializer = new XmlSerializer(typeof (Config));
                using (var writer = new StreamWriter(ConfigPath))
                    serializer.Serialize(writer, this);
            }
        }
    }
}