From the
HFSLIP64 homepage's 'Basic Information' section :
QUOTE
DIRECTX9 EXTRAS
Extra DirectX9 binaries for gaming and content development which are supported on x64 editions of Windows XP and Server 2003 are slipstreamed. To have these, simply place the latest DirectX9 redistributable in the HF folder.
On the HFSLIP64 homepage, there are also TC's update lists, which states exactly where every update or component should be placed, together with there direct download links...
TC's XPSP2-x64 List.