Note that the data files indexes are extremely large and may require several minutes to display over slow connections. You may be prompted to install a component when using the File Exchange tool to download the files.
The directory structure is RefData.YY/Month.XXX/Day.DD where YY is that last two digits of the year, XXX is an abbreviation for the month and DD is the day of the month.
Each file is named using a YYMMDDHH.zip format. Where YY is the last 2 digits of the year, MM is the month, DD is the day of the month and HH is the start time of the data file in Pacific Time (24-hour format).