BoycottNovell has the right vision of the Microsoft ecosystem:
Remember the goals of OOXML:
Goal No. 1
Keep the other numerous car-makers from advancing their technology […]
ODF in this case.
Goal No. 2
Lure as many developers into building useful apps (or the entire car) with Microsoft-technology.
You cannot implement OOXML without Microsoft dependencies, whether they are legal (FRAND patent license) or technical (WMV files in an OOXML document).