Shoutbox

I'm trying to make a wlm 2009 skin, but i'm finding two problems.

First: most of the times when I pack and try to import the skin plus sais that's not a valid Messenger Plus! Skin Pack.

Second: When I'm able to import, the images i replaced just aren't replaced.

Here goes a sample:

<SkinInfo>
   <Information>
    <Name>Example</Name>
    <Compatibility>
    <MsgVersion Major="14" Minor="0"/>
    </Compatibility>
   </Information>
   <MessengerSkin>
    <ResGroup>
       <Resources>
        <Replace>
           <Graphics>
            <Pictures>
               <Picture Id="1828"><File>Graphics/images/backdown.jpg</File></Picture>
            </Pictures>
           </Graphics>
        </Replace>
       </Resources>
    </ResGroup>
   </MessengerSkin>
</SkinInfo>

Can somebody tell me what am I doing wrong?