Major Description
Wine's version of RtlCreateActivationContext expects an ACTCTXW structure, so kernel32's CreateActCtxW is a no-op for them.
However in Windows, RtlCreateActivationContext uses the ACTIVATION_CONTEXT_DATA structure, and kernel32's function performs a conversion.
As a result, our BasepProbeForDllManifest will not work with a correctly implemented version of RtlCreateActivationContext (which we e.g. get when running with Windows's ntdll like on the VMware-Hybrid testbot), and always return STATUS_SXS_INVALID_ACTCTXDATA_FORMAT.
cc fireball