xbox dash background help

[bold]can anyone tell me how to do this? ok i downloaded a background file from allxboxskins and it says i have to do this:[/bold]

what you need:
-tHc current version
-winxip 0.88

instruction:
-insert xboxbg.xbx in default.xip

NOTE:

Extract "default.xap" from your "default.xip".
Find the line "skyColor 0 0 0".
Add "backdrop ImageTexture (url "xboxbg.xbx").

It should look like this:

DEF theBackground Background
{
skyColor 0 0 0
backdrop ImageTexture {url "xboxbg.xbx"}
}

[bold]can anyone explain this to me a little better?[/bold]