Thank you Arno...
every time we convert a model to FS, mcx always show us whether we have got permission from author for convert copyrighted the model.
so... if we using this tools, I am sure many of us use this tools to produce a payware sceneries, don't forget credit to Arno :D
usually I use collada(*dae) object to remove the mini polygon.
when download from warehouse sketchup, pick *.kmz file then remane to *.zip
extract the *.dae only and convert with modelconverterx into *.3ds :p