Was just going to mention those versions. The bigger question is, why run them through the converter to make toolpaths when you could open them in VCP/Aspire and have much more control over the toolpath? Maybe you don't have either of those programs, but even the older ShopBot PartWorks/PartsWizard would be good too.

Dxf's need to be drawn in consecutive order for them to cut in that order, otherwise they can be all over the place and poorly optimized.