Thanks. I ran my MSI with Sysinternals Process Monitor running and I can see that DrvInst is executed which then calls rundll32 to register the driver. So it appears that the MSI is built properly with the drivers. However, they are not actually being installed by rundll32. Rundll32 returns success so something funny seems to be going on that I haven't figured out yet. But at least it's not a Wix# problem.
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