5.6.3 Document Properties Stream Name
Property sets, when applied to files, use a number of different stream names. The initial character is Unicode U+2663, known as (BLACK CLUB).
The names "♣BnhqlkugBim0elg1M1pt2tjdZe", "♣SummaryInformation" and the GUID {4c8cc155-6c1e-11d1-8e41-00c04fb9386d} are used.
The fully qualified names would be as follows:
sample.doc:♣BnhqlkugBim0elg1M1pt2tjdZe:$DATA
sample.doc:♣SummaryInformation:$DATA
sample.gif:{4c8cc155-6c1e-11d1-8e41-00c04fb9386d}:$DATA