You need a 2D CAM program that does pocketing, like VCarve Pro or SheetCAM. Get rid of the hatch, make everything closed polylines, and save as v12 .dxf
A free alternative is to use the AutoCAD macro I wrote, http://home.comcast.net/~cncwoodwork.../AC2GCv039.zip
You'll need to draw the actual toolpaths with polylines. It will export g-code directly from AutoCAD.