declaration:

        [DllImport("pk2.dll")]
        private extern bool Initialize();

        [DllImport("pk2.dll")]
        private extern bool Open(string path);

        [DllImport("pk2.dll")]
        private extern bool Extract(string filename,string path,string newfilename);



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        private void button2_Click_1(object sender, EventArgs e)
        {
            if (Initialize())
            {
                if (Open(@"E:\Games\Srrrrrrr\Media.pk2"))
                {
                    if (Extract(@"earring_01.ddj", "icon\\item\\china\\acc\\",""))
                    {
                        //string s = System.Reflection.Assembly.GetExecutingAssembly().Location + "\\A_0.tmp";
                        string s = Application.StartupPath + "\\temp\\A_0.tmp";
                        Bitmap a = DevIL.DevIL.LoadBitmap(s);
                        pictureBox1.Image = a;
                        Extract("itemdata_5000.txt", "server_dep\\silkroad\\textdata\\", "ID_0.tmp");
                        Extract("itemdata_10000.txt", "server_dep\\silkroad\\textdata\\", "ID_1.tmp");
                        Extract("itemdata_15000.txt", "server_dep\\silkroad\\textdata\\", "ID_2.tmp");
                        Extract("itemdata_20000.txt", "server_dep\\silkroad\\textdata\\","ID_3.tmp");
                        Extract("itemdata_25000.txt", "server_dep\\silkroad\\textdata\\", "ID_4.tmp");
                        System.IO.StreamReader r = new System.IO.StreamReader("temp\\ID_0.tmp");
                        //MessageBox.Show("Success");
                    }
                    else MessageBox.Show("Fail Extract");
                }
                else MessageBox.Show("Fail Open");
            }
            else MessageBox.Show("fail Initialize");
        }

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        private IEnumerable<string> ReadLines(StreamReader reader)
        {
            while (!reader.EndOfStream)
            {
                yield return reader.ReadLine();
            }
        }

        private void Filter1(string filename)
        {
            using(var writer = File.CreateText(Application.StartupPath + "\\temp\\test.txt"))
            {
                using (var reader = File.OpenText(filename))
                {
                    int[] Ids = { 14652, 14653, 14654, 14655, 14656, 14657, 14658, 14659, 14660 };
                    var myLine = from line in ReadLines(reader)
                                 where line.Length > 1
                                 let id = int.Parse(line.Split('\t')[1])
                                 where Ids.Contains(id)
                                 let m = Regex.Match(line, @"^\d+\t\d+\t.+?\t(item\\[^\t]+\.ddj)")
                                 where m.Success == true
                                 select new { Text = line, ItemId = id, Path = m.Groups[1].Value };


                    foreach (var id in myLine)
                    {
                        writer.WriteLine("Item Id = " + id.ItemId);
                        writer.WriteLine("Path = " + id.Path);
                        writer.WriteLine("\n");
                    }

                }
            }
        }