I did a slipstream integration of SP1 into XP. Can one be done to add DX9 as well?

The closest thing I can think of is

1. Providing a silent automated installation using CMDLINES.txt ... a pain perhaps, with a combination of sysprep.exe of course

2. This link http://berns.cae.wisc.edu/pages/wincdman.asp

Thanks, but that does seem like a bit of a pain. I think I will just install DX9 after the XP install.

try with this program. http://berns.cae.wisc.edu/pages/wincdman.asp