@IB
I think the 3 files are listed on the site
http://www.betaplace.co.uk/ssp1.asp
Also for slipstreaming I use the IEXBeta slipstreaming tool which seems quite easy as it helps automate the process.
Slipstreamed my Windows Server that way and didn't need to add the extra file
Didn't manage to make it bootable though :P
Has anyone else tried it?