Although basic text files contain no metadata, the following tags are
determined from a simple analysis of the data in TXT and CSV files.
Statistics are generated only for 8-bit encodings, but the FastScan (-fast)
option may be used to limit processing to the first 64 KiB in which case
some tags are not produced. To avoid long processing delays, ExifTool will
issue a minor warning and process only the first 64 KiB of any file larger
than 20 MiB unless the IgnoreMinorErrors (-m) option is used.