The model products are archived (currently on NASA/HEC/Pleiades) into five chunks with the following format:

FlexpartOutput.tar-*.tar (data files)
FlexpartOutput.tar-*.tar.sum (information file)
FlexpartOutput.tar-*.tar.toc (information file)
(* represents 1-5)

For each chunk, after extraction, there are several folders (details are described in the "sum" and "toc" files). 
Each folder contains 1 month's outputs, formatted as:
WUSA_201607_v2

Each folder includes our native binary files along with simulation settings information, such as:
WUSA_201607_v2

grid_time_20160731225000_001
RELEASES.namelist
header