On my site, you'll find a CAB which is integrateable either via nLite or with the Integrator app found also on my site. It directly integrates WMP10 into the CD so that WMP10 directly replaces WMP9 from the start. It's the most efficient way to do things since it requires no extra time during setup to install and it uses the least amount of space since it's mostly overwriting existing files with new ones. And as you'll probably see from my site, I'm big into direct integration