Tiny program for quick words replacement in UTF8 text files

gistfile1.txt

using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;

namespace find_rep
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, string> dict = new Dictionary<string, string>();

            if (!File.Exists("find_rep.cfg"))
            {
                Console.WriteLine("Configuration file find_rep.cfg is missing: nothing to find");
            }
            else if (args.Length == 0 || !File.Exists(args[0]))
            {
                Console.WriteLine("No input file provided. Usage find_rep.exe <text_file>");
            }
            else
            {
                try
                {
                    // Load dictionary
                    foreach (var s in File.ReadAllLines("find_rep.cfg"))
                    {
                        var kv = s.Split(new char[] { '\t' });
                        if (kv.Length == 2) dict[kv[0]] = kv[1];
                    }

                    // Do all replacements
                    var text = File.ReadAllText(args[0]);
                    foreach (var kv in dict)
                        text = ReplaceWholeWord(text, kv.Key, kv.Value);

                    // Save file
                    File.WriteAllText(args[0], text);
                }
                catch (Exception e)
                {
                    Console.WriteLine("Exception during execution: " + e.Message);
                }
            }
        }

        static string ReplaceWholeWord(string original, string wordToFind, string replacement)
        {
            string pattern = string.Format(@"\b{0}\b", wordToFind);
            return Regex.Replace(original, pattern, replacement, RegexOptions.None);
	}
    }
}