I tried to open your DXF in inkscape as well as some online convertors and they all came up empty. I think something went wrong with the conversion of fusion 360 to turbocad. I opened your DXF with solidworks and it seems it is still a 3D object. I took the liberty to save it for you as a regular DXF:
DisplayBoard v4-1.DXF (44.5 KB)
This one should work with the app.
@ReneGoderich, I haven’t forgotten about you, I’m looking in a way to close paths in solidworks. When I figure it out myself, I’ll let you know.
@B.F the app can only convert DXF to SVG, pdf or AI formats are not supported.