Need help for decrypting account file.

Ok.I've been working on this so long but ive never been successful.Here is the code i use:

Code:

 byte[] buffer;
        private void Form1_Load(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                Array.Resize(ref buffer, 16);
                byte[] firstbytes = new byte[16];
                System.IO.BinaryReader breader = new System.IO.BinaryReader(new System.IO.FileStream(ofd.FileName, System.IO.FileMode.Open));
                firstbytes = buffer = breader.ReadBytes(16);
                byte[] hmackey = { 0xE1, 0xBC, 0x15, 0x9C, 0x73, 0xB1, 0xEA, 0xE9, 0xAB, 0x31, 0x70, 0xF3, 0xAD, 0x47, 0xEB, 0xF3 };
                System.Security.Cryptography.HMACSHA1 h = new System.Security.Cryptography.HMACSHA1(hmackey);
                byte[] rckey = h.ComputeHash(buffer);
                Array.Resize(ref rckey, 0x10);
                Array.Resize(ref buffer, 8);
                buffer = breader.ReadBytes(8);
                RC4(ref buffer, rckey);
                byte[] confounder = new byte[8];
                Array.Copy(buffer, confounder, 8);
                byte[] decrypteddata = new byte[380];
                Array.Resize(ref buffer, 380);
                buffer = breader.ReadBytes(380);
                RC4(ref buffer, rckey);
                Array.Copy(buffer, decrypteddata, 380);
                breader.Close();
                breader.Dispose();
                SaveFileDialog sfd = new SaveFileDialog();
                if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    FileStream fileStream = new FileStream(sfd.FileName, FileMode.Create, FileAccess.ReadWrite);
                    fileStream.Write(decrypteddata, 0, decrypteddata.Length);
                    fileStream.Close();
                }
 
            }
        }
        public void RC4(ref Byte[] bytes, Byte[] key)
        {
            Byte[] s = new Byte[256];
            Byte[] k = new Byte[256];
            Byte temp;
            int i, j;
 
            for (i = 0; i < 256; i++)
            {
                s = (Byte)i;
                k = key[i % key.GetLength(0)];
            }
 
            j = 0;
            for (i = 0; i < 256; i++)
            {
                j = (j + s + k) % 256;
                temp = s;
                s = s[j];
                s[j] = temp;
            }
 
            i = j = 0;
            for (int x = 0; x < bytes.GetLength(0); x++)
            {
                i = (i + 1) % 256;
                j = (j + s) % 256;
                temp = s;
                s = s[j];
                s[j] = temp;
                int t = (s + s[j]) % 256;
                bytes[x] ^= s[t];
            }
        }

I need help.I dont understand why it does not decrypt.

http://www.free60.org/Profile:Account