~/.xbmc/userdata/keymaps/remote.xml for Xbox Classic Remote (DVD) on XBMC with orig Dongle.

remote.xml

<keymap>
   <global>
     <remote>
       <three>volumeup</three>
       <six>volumedown</six>
       <nine>mute</nine>
     </remote>
   </global>
   <FullscreenVideo>
     <remote>
       <three>volumeup</three>
       <six>volumedown</six>
       <nine>mute</nine>
     </remote>
   </FullscreenVideo>
   <VideoMenu>
     <remote>
       <three>volumeup</three>
       <six>volumedown</six>
       <nine>mute</nine>
     </remote>
   </VideoMenu>
 </keymap>