Set an integer to correspond to the stack ID of a stack
member. For devices that are not capable of being stacked, set
with the value 1. For a chassis switch, it corresponds to the
card ID.
Subsequent SNMP queries to the atFilev2Table will use this as
the stack member to generate a file listing from.
NOTE: atFilev2Table and associated objects have been replaced
by atFilev2FileViewer.