By popular demand, starting with today's data release (v1.21), the data dump includes a CSV version of the ROR data file in addition to the canonical JSON file.
The data dump zip therefore now contains two files instead of one. If your code currently expects only one file, you will need to update it accordingly.
The CSV contains a subset of fields from the JSON file, some of which have been flattened for easier parsing. The JSON file remains the version of record.