Well Unreal World has finally been updated and now runs natively on windows rather than through the DOS emulation. And I've already updated my map/character editor to work on the latest version :). You'll need version 2 of the .NET framework to run my editor.
URW - http://www.jmp.fi/~smaarane/urw.html
My editor - http://members.byond.com/Theodis/files/URWEditorV1.1.zip