CNC gurus,

Does anyone know what software creates GD4 files ? I have been given one and asked If I can do anything with it. Google searches turned up noting useful.
Its for a gasket and I'm pretty sure its the file thats sent to a digital drag knife to cut.
Its a bit of a long shot but Id like to try to convert it to something usable (DXF,EPS, or any vector file really).

I know that its possible to convert g-code to dxf, I'm just not sure If this is.

Any suggestions welcome.