static void Main(string[] args)
        {
            if (args.Length < 1)
            {
                return;
            }

            var path          = Path.GetFullPath(args[0]);
            var basePath      = Path.GetDirectoryName(path);
            var pathName      = Path.GetFileNameWithoutExtension(path);
            var pathExtension = Path.GetExtension(path);

            if (pathExtension.Equals(".xpac", StringComparison.InvariantCultureIgnoreCase))
            {
                var outputBasePath = Path.Combine(basePath, pathName);
                Directory.CreateDirectory(outputBasePath);

                // unpack xpac file
                using (var packFile = new PackFile(path))
                {
                    foreach (var entry in packFile.EnumerateFileEntries())
                    {
                        var hasName       = entry.Name != null;
                        var entryFileName = hasName ? entry.Name : entry.Hash.ToString("X8");
                        Console.WriteLine($"Unpacking {entryFileName}");

                        var entryFilePath = Path.Combine(outputBasePath, entryFileName);
                        var entryStream   = packFile.OpenFile(entry.Hash);

                        byte[] fourcc = null;
                        if (!hasName)
                        {
                            fourcc = new byte[16];
                            entryStream.Read(fourcc, 0, ( int )Math.Min(entry.UncompressedSize, 16));

                            if (fourcc.Length >= 4 && (fourcc[0] == 'R' && fourcc[1] == 'I' && fourcc[2] == 'F' && fourcc[3] == 'F'))
                            {
                                if (fourcc.Length >= 12 && (fourcc[8] == 'X' && fourcc[9] == 'W' && fourcc[10] == 'M' && fourcc[11] == 'A'))
                                {
                                    entryFilePath = Path.ChangeExtension(entryFilePath, ".xwm");
                                }
                                else
                                {
                                    entryFilePath = Path.ChangeExtension(entryFilePath, ".wav");
                                }
                            }
                            else if (fourcc.Length >= 5 && (fourcc[0] == '<' && fourcc[1] == '?' && fourcc[2] == 'x' && fourcc[3] == 'm' && fourcc[4] == 'l'))
                            {
                                entryFilePath = Path.ChangeExtension(entryFilePath, ".xml");
                            }
                            else if (fourcc.Length >= 8 && (fourcc[4] == 'F' || fourcc[5] == 'O' || fourcc[6] == 'R' || fourcc[7] == 'E'))
                            {
                                entryFilePath = Path.ChangeExtension(entryFilePath, ".forest");
                            }
                            else if (fourcc.All(x => char.IsLetterOrDigit(( char )x)))
                            {
                                entryFilePath = Path.ChangeExtension(entryFilePath, ".txt");
                            }
                        }

                        Directory.CreateDirectory(Path.GetDirectoryName(entryFilePath));
                        using (var entryFileStream = File.Create(entryFilePath))
                        {
                            if (!hasName)
                            {
                                entryFileStream.Write(fourcc, 0, fourcc.Length);
                            }

                            entryStream.CopyTo(entryFileStream);
                        }
                    }
                }
            }
            else if (Directory.Exists(path))
            {
                // pack xpac from folder
                var packFileBuilder = new PackFileBuilder(@"D:\Games\PC\SteamLibrary\steamapps\common\Sonic and SEGA All Stars Racing\");

                foreach (var file in Directory.EnumerateFiles(path, "*.*", SearchOption.AllDirectories))
                {
                    if (Path.GetFileNameWithoutExtension(file) != "2D529B4E")
                    {
                        packFileBuilder.AddFile(file, true);
                    }
                    else
                    {
                        packFileBuilder.AddFile(file, false);
                    }

                    Console.WriteLine($"Added {file}.");
                }

                Console.WriteLine("Packing xpac...");
                packFileBuilder.BuildFile(Path.ChangeExtension(path, ".xpac"));
            }
        }