This contains the resource fork of the uploaded file. The
representation of the data is a Variant containing a SafeArray of
Bytes. This binary format is frequently required when inserting a
BLOB into a database.
Unless the upload was encoded in MacBinary this property will
contain an empty array.
The lower bound of this array is always zero and the upper bound
is equal to the size of the data minus one. If no data has been
uploaded the upper bound will be minus one.