Check the '..\Divine Divinity\Run' folder for any files named 'config'. Starting with XP, MS' default option in Explorer is to hide file extensions for known file types (you can change this in the Options). There should be two such files in the run folder, config.div and config.lcl (if the extensions are hidden, the file type should differentiate them, if the folder view is set to details).

The divinityevent.dat file is not what you need to edit. The config.div file should look similar to below (some entries may be missing, depending on your options, but the first 2 for the game resolution will be there, and in that format).

Quote
// display width
width 1024

// display height
height 768

// activate smooth mode
smooth 1

// global contrast
contrast 1.000000

// global gamma
gamma 1.000000

// show the intro movies
startup logo 0

// enable quickstart
quickstart "on"

// use compressed image lists
images compressed

// use flat file system
flat files

// enable/disable z-tunneling
ztunnel 1

// set the memory limit
memory limit 32

// enable/disable the use of bitmapped fonts
use8bitfont 1

// disables fog rendering
no fog