Hi Francois,
I think that's the problem. Wine reimplements the Windows' Platform SDK Win32 and Win64 APIs, not Windows Mobile which is what the PowerPC SDK is. Apparently there are some differences so it would be best not to mix the two.
Note that this is not to say that Wine should not also implement the Windows Mobile API, just that adding support for it would require larger adjustments.
It shouldn't be a problem, this is the only place you can get a reference to these interfaces. It appears that once these interfaces were Deprecated they where removed from the SDK for msxml. See MSDN to show that they now deprecated, and they aren't just for Mobile Devices. http://msdn.microsoft.com/en-us/library/ms757816%28VS.85%29.aspx
It was part of the msxml3 at some point on windows, see bug http://bugs.winehq.org/show_bug.cgi?id=5841
Best Regards Alistair Leslie-Hughes