I haven't been able to get it working with D3D Windower, I was however able to getting it
running in windowed mode with DXWnd. Go to
http://appaholic.co.uk/2007/10/16/dxwnd-force-almost-anything-into-a-windowed-mode/ and
download the package.
Run DXWnd and remove the MapleStory entry. Add both NavyFIELD.exe and NavyFIELD
Launcher.exe Modify the NavyFIELD.exe as below and it should work.
This was tested on Win 7 Ultimate x64. N.B. Navyfield does not like SLI add a profile for
NF and change SLI mode to "Single".