This disk contains datasets for John Fox, Applied Regression Analysis, 
Linear Models, and Related Methods (Sage, 1997). 

The .cbk files contain codebooks for the datasets.

The .dat files contain the data themselves. 

The file fox.zip contains a zip archive of all of the datasets.

The file fox.exe contains a self-extracting archive with all of the datasets. 

If you plan to redistribute the data, the archives provide a convenient way of doing so.