The '..\Divine Divinity\Run\config.div' file is plain text, and can be opened in any text editor (such as Notepad). DivX apparently also uses that extension, but if you hold the Shift key down and right click on the file, you should get an 'Open With' context menu entry which will let you open it in a text editor, or you can drag and drop the file onto a Desktop shortcut for an editor, etc.
See my post above for more details.
