TRD file is a RIFF like container that hold a series of TrID's definitions.
TrIDDefs.TRD is the default databases used by TrID file identification tool, if no other
TRD database is given by
.TRD files start with ASCII "
RIFF", have "
TRID" at offset 8, and
DEFN at offset 12.
- https://mark0.net/download/triddefs.zip → TrIDDefs.TRD