That is because it is for imaging with DOS only, as far as I know. I think it was not even used for WinPE.
If you need a different driver in WinPE, follow the add a driver to winpe document:
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One thing to note, if you check that box it will cause the WinPE script to fail. It will add a couple of entries to the OSD script.
Just a heads up.
Sounds like development should remove or grey that section out when using a WinPE script.
Thank you guys so much. One customer was asking this question.