The files are self-expanding (file extension .EXE)
The data is then available in ARC/INFO® EXPORT (extension
.E00) and in MapInfo® Version 4.0 for Windows format (4 files per download,
extensions .TAB, .ID, .DAT, and .IND)
DBF: File name ends with “a”
DCF: File name ends with “b”; file name for water layer ends with “c”