How to "edit IPTC/XMP" metadata for DNG files?

[cadu]

Hi,

I've tried to "edit IPTC/XMP" metadata for DNG files, as showed in the snapshot below, but the options is shaded (not accessible).
Is it possible to set XnViewMP (0.86) for editing DNG's "IPTC/XMP" metadata?

Thanks for info!

[xnview]

sorry but currently it's not possible