I don't see anything in that file. But suffice it to say that you should be exporting everything in the form of lines and arcs in your dxf, because that is what your cnc machine needs to base its motion commands on. Whether that is what "explode" does, I'm not sure, but give it a try. Even if sheetcam can make sense of a polyline, it'll probably do just fine with lines and arcs.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)