If I understand correctly, you're trying to go from Wilbur to FT. If that is the case, it might be easier to save the file in Wilbur as an .mdr file then opening it as a binary file in FT. You'll just have to make sure you set your edges (Surface>>Map Info) to;

Top = 90
Left = -180
Right = 180
Bottom = -90

You'll probably want to flip the map as well (Surface>>Rotate>>Flip Vertical) before saving so that it loads right side up in FT.

If I'm understanding your question wrong, well, just ignore all of this.

GW