unexpected char: 'U'. when File.WriteAllBytes()

 File.WriteAllBytes("C:\Users\koneo\Desktop\swagtest.unitypackage",www.bytes);

So I don't know what's wrong, if you wan't the whole script, here it it:

 // UnityScript
 @script ExecuteInEditMode()
 import System.IO;
 class MyWindow extends EditorWindow {
 
     private var www : WWW;
     var target : Renderer;
     var texture : Texture2D;
     var texture2 : Texture2D;
     var texture3 : Texture2D;
     var one : int = 1;
     var done : boolean;
     var loc : String;
     var lo : String;
 
     @MenuItem ("Window/My Window")
     static function ShowWindow () {
         EditorWindow.GetWindow (MyWindow);
     }
 
     function OnGUI () {
         if(GUILayout.Button("Download")){  
             //LoadTexture("http://download.unity3d.com/webplayer/images/unity-icon-big.jpg"); 
             LoadTexture("http://205.196.123.154/8tbwv4bmbj5g/49sddaa4vkxadr1/CtoJS.unitypackage");
         }
         texture = EditorGUI.ObjectField(Rect(3,60,200,20),"Add a Texture:",texture,Texture);
         if(texture){
             EditorGUI.DrawPreviewTexture(Rect(25,150,100,100),texture);
         }
         /*if(texture2){
             EditorGUI.DrawPreviewTexture(Rect(25,252,100,100),texture2);
         }
         if(texture3){
             EditorGUI.DrawPreviewTexture(Rect(25,353,100,100),texture3);
         }*/
         if(done){
             
             if(GUI.Button(Rect(200,200,200,100),"Export")){
                 //loc = EditorUtility.OpenFolderPanel("Select animations folder...", "", "");
                 AssetDatabase.ExportPackage("Assets/Materials/Fade.mat", "Exported Test.unitypackage"); 
             }
             //
             
             if(GUI.Button(Rect(200,400,200,100),"copy from")){
                 //lo = EditorUtility.OpenFolderPanel("Select animations folder...", "", "MAT");
                 lo = EditorUtility.OpenFilePanel("Hi","","png");
             }
             if(GUI.Button(Rect(500,300,50,30),"Start")){
                 FileUtil.CopyFileOrDirectoryFollowSymlinks(lo,loc);
             }
             if(GUI.Button(Rect(560,300,50,30),"To")){
                 //loc = EditorUtility.OpenFolderPanel("Select animations folder...", "","");
                 loc = EditorUtility.OpenFolderPanel("lol","","");
             }
             //
             
             if(GUI.Button(Rect(500,200,200,100),"Create Asset")){
                 AssetDatabase.CreateAsset(www.texture, "Assets/MyMaterial.mat");
             }
             
         }
     }
     function OnEnable(){
     //    LoadTexture("http://download.unity3d.com/webplayer/images/unity-icon-big.jpg");
         done = false; 
     }
 
     function LoadTexture(url)
     {
         www = new WWW(url);
         #if UNITY_EDITOR
         if (!EditorApplication.isPlaying)
             EditorApplication.update = MyUpdate;
         else
             WaitForDownload();
         #else
         WaitForDownload();
         #endif
     }
 
     #if UNITY_EDITOR
     function MyUpdate ()
     {
         if (www.isDone)
         {
             EditorApplication.update = null;
            LoadCompleted();
         }
     }
     #endif
 
     function WaitForDownload(){
         yield www;
         LoadCompleted();
     }
 
     function LoadCompleted(){
         //texture = www.texture;
         //AssetDatabase.CreateAsset(www.assetBundle,"Assets/swag.unitypackage");
         //Debug.Log("name = "+www.bytes.ToString);
         File.WriteAllBytes("C:\Users\koneo\Desktop\swagtest.unitypackage",www.bytes);
         done = true;
         
     }
 }