Hmm...

Im decompiling RuneScape's client files like Runescape.zip WinRAR Archive and Loader.cab WinRAR Archive. Heres Unpack from Loader:

Code:

import java.io.*;
import java.util.Hashtable;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class unpack
{
    protected Hashtable cache;
    public final byte[] a(int i, String s)
    {
        try
        {
            int j = -34 % ((7 - i) / 62);
            return (byte[])cache.remove(s);
        }
        catch(RuntimeException runtimeexception)
        {
            throw runtimeexception;
        }
    }
    protected unpack()
    {
        cache = new Hashtable();
    }
    public unpack(byte abyte0[])
        throws IOException
    {
        cache = new Hashtable();
        try
        {
            ZipInputStream zipinputstream = new ZipInputStream(new ByteArrayInputStream(abyte0));
            byte abyte1[] = new byte[1000];
            do
            {
                ZipEntry zipentry = zipinputstream.getNextEntry();
                if(zipentry == null)
                {
                    break;
                }
                String s = zipentry.getName();
                if(s.endsWith(".class"))
                {
                    s = s.substring(0, s.length() + -6);
                    s = s.replace('/', '.');
                    ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
                    do
                    {
                        int i = zipinputstream.read(abyte1, 0, 1000);
                        if(i == -1)
                        {
                            break;
                        }
                        bytearrayoutputstream.write(abyte1, 0, i);
                    } while(true);
                    byte abyte2[] = bytearrayoutputstream.toByteArray();
                    cache.put(s, abyte2);
                }
            } while(true);
            zipinputstream.close();
            return;
        }
        catch(RuntimeException runtimeexception)
        {
            throw runtimeexception;
        }
    }
}

Maybe we can try and create a 456 client using the files yet the question is how?