Any experience with Nikon .nksc sidecar files?

Nikon - in particlular its raw editor NX Studio - saves image adjustments to sidecar files (.nksc) in an 'NKSC_PARAM' folder in the same folder as the original raw file. FastRawViewer uses the more standard .xmp sidecar file in the same folder as the original.
Apart from this quirk NX Studio is a very decent programme and I'm enjoying using it - I just wish it communicated better with FRV - esp. re. ratings and labels.
Does anyone have any experience of working with .nksc files? Are there any settings within FRV which would help NX Studio read ratings or labels set by FRV?
Thanks.