If you generate your own datafiles, extract only the files you want replaced.

cklist.dat - Pack Rat bands.
ck2list.dat - Calls w/operator names.
logsort.dat - Good Calls file.
ratslist.txt - Printable Pack Rat bands list.
sixdigit.dat - 6-digits (SQUARES file).
vhf4k.adi - 5000+ callsign ADIF (created by K9PW - updated by W3KM).
Note: You can use your own ADIF and select it in VHFLOG and KM Rover.
      This file must be in the same format as vhf4k.adi however.

VHFLOG or KM Rover users living in the NE part of the country:
If you wish you can get my datafiles before the contest. Click the link
and a WinZip window opens. Extract the files to the c:\vhflog32 or
c:\kmrover32 folder. To see the changes, run the logger after updating.