This is a command line program, reading a dxf file and saving a converted dxf file, with splines converted to lines and arcs. It uses code from HeeksCAD https://github.com/Heeks/heekscad
Using OpenCASCADE 6.9.
To build on Windows ( I haven't finished trying this... )
Download Microsoft Visual Studio 2013 Community Edition ( OpenCASCADE 6.9 has pre-built binaries for Visual Studio 2013 ).
Download OpenCASCADE 6.9 with pre-built binaries for VS 2013.