Attempting to confirm the existence of such a track or collaboration with Metallica leads one to many sites indicating that no such thing exists. It is either a purposeful or accidental mis-tagging or naming of the audio file.
The track in the file was performed by:
Savatage - Dead Winter Dead - 12 - Christmas Eve (Sarajevo 12/24)
and appears to have been re-releasedby the side project in following christmas seasons…