Archived from groups: microsoft.public.windowsxp.customize (More info?)
By default in XP, it can't be manually changed. The text changes on its own
from dark to light depending on the color of the background. It is based on
the Desktop color not the Wallpaper. The combo is whether or not you are
using a Wallpaper and what the Desktop color is.
All the Best,
Microsoft-MVP Windows® XP
2004 Windows MVP "Winny" Award