ffmpeg.exe is licensed under GPL.

The source code can be found below. Simply create a new Console Project in VC# and paste in the code below.

Program.cs
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using System;
using System.Collections.Generic;
using System.Text;

namespace blank
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("The correct ffmpeg binary was not found");
            Console.WriteLine("Please download ffmpeg.exe version CVS build 4759 and place it in this directory.");
            Console.WriteLine("It can be found at this link:");
            Console.WriteLine("http://www.videohelp.com/download/3GP_Converter034.zip");
            Console.WriteLine("ffmpeg : no such file or directory");
        }
    }
}