Adding DirectX prerequisite

[djm]

What's the best way to incorporate the latest DirectX runtime into a IA installer? Microsoft's current rev is a February '07 redist
and it looks like the current IA runtime is 90b so I can't use that built-in functionality of IA. How are people adding the latest DirectX to their installers?

I took the approach of simply including the available 90b runtime check* and setup* scripts and modifying the "Check/Install DirectX Runtime" function to get the actual version rather than just returning true/false. I then replaced the Plug-Ins\\DirectX Runtime\\9b directory contents with a later version of DirectX expecting IA would just use this directory with the same named dxsetup.exe and run my later directx installer.

This doesn't seem to work though. When I step through the the setup* script and call "Check/Install DirectX Runtime" again to actually install it, it just quickly returns a "SUCCESS" without doing anything. Maybe I cannot use this built-in plugin to install a later version? Is filebag my only choice here?