I assume this is somewhere in the ViewUI.xml; any ideas? At night it's not easy to see blue, so I need a more luminous yellow.

EDIT: Well problem solved as changed FriendColor="0xFF00OOFF" to FriendColor="0xFF00FFFF", which is a light blue. The enemy red FriendColor="0xFF00FFFF" shows up well enough, as does the target yellow.