Particle Installer for Sprowl

using System;
using System.IO;

namespace ParticleInstaller
{
    class Program
    {
        private const string PARTICLE_PATH = "particles/sprowl_particles.pcf";
        private const string PARTICLE_MANIFEST_PATH = "particles_manifest.txt";

        static void Main(string[] args)
        {
            if (IsPortal2Running())
            {
                Console.Write("Portal 2 is running, you will need to restart portal 2 after this installation.\n Press any key to contine...");
                Console.ReadKey(true);
            }

            if (!File.Exists(PARTICLE_MANIFEST_PATH))
            {
                Console.Write("Cannot locate '" + PARTICLE_MANIFEST_PATH + "' ensure that it is in the same folder as\nthis executable before running.\nPress Any key to close...");
                Console.ReadKey(true);
                return;
            }

            string filecontents = File.ReadAllText(PARTICLE_MANIFEST_PATH);
            if (filecontents.Contains(PARTICLE_PATH))
            {
                Console.Write("There is already a refrence to these particles in the manifest, if you are\nexperienceing issues with the particles, verify your game cache, and re-run this\nexecutable.\n Press any key to close...");
                Console.ReadKey(true);
                return;
            }
            File.WriteAllText(PARTICLE_MANIFEST_PATH, filecontents.Insert(filecontents.IndexOf('}'), "\t\"file\"\t\"" + PARTICLE_PATH + "\"" + Environment.NewLine));
            Console.Write("The refrenece to the " + PARTICLE_PATH + "' has been added, you may now run\nPortal 2.\n Press any key to close...");
            Console.ReadKey(true);
        }

        public static bool IsPortal2Running()
        {
            return System.Diagnostics.Process.GetProcessesByName("portal2").Length != 0;
        }
    }
}