I don't know whether this will work - so don't blame me if...........
If you have the four image panes displayed the bottom right is usually just the model.
click this pane and then do the export - this may work.
My problem was the opposite - I was exporting to .wrl - and I wanted all three of my images - I exported three separate models - clicking on the panes top left, top right, bottom left - to export the planes - I then cut and pasted the code from two of the files into the third using Notepad.
Can w3d file be edited in NotePad? if so simply delete the offending lines of code...