I'm going to assume the software they're using is FeatureCAM as I can't find any reference to anything known as FutureCAM.
Anyway, the way it works with toolpath software is that the actual toolpath is created on a PC, then output via 'post-processing' in a format that particular CNC router can understand. While there is a standard machine code each manufacturer uses a slightly different way of giving that info to the machine, which is what the post processing attends to.
Within the toolpathing applications there are different ways to approach things. A big section of electric guitar body work can be done with 2.5d machining, which only requires 2d drawing for stuff like pickup cavities, neck pockets etc. Basically anything that can be done with a hand held router and templates is 2.5d pocketing work - you give it an outline and tell it to cut to a specified depth in z-axis (vertical) steps of whatever the machine, tool and material can handle. 3d is only needed for curved surfaces like tummy and arm contours.
What I'm getting at here is that even if you do get accurate 3d dwg or dxf files the person generating the toolpath will likely need to pull 2d geometry from that and define machining regions, depths, speeds etc, and work out a way of indexing (locating) the workpiece so that it can be flipped to do the front and back and have everything line up properly, then make the relevant jig. There's still a lot of person-work going on, and while it's much more accurate than the old fashioned way it's not necessarily faster if you're doing one off bodies (depends on the tools you have available I suppose).
Projectguitar hosts a bunch of autocad guitar body files but the majority are useless. I think 1 or 2 of the JEM files are good but can't remember for sure. And like Cameron said above, you need to what format of dxf or dwg their software likes best, and you need to be able to output it. That means you might need to be running Autocad or other CAD to be able to export with the right options (autocad version and the way it exports the geometry within that).