The only tool that can reliably work with TC3 CAD files is TurboCAD and this is the software you have to use if you want to export the CAD designs to another format, for example the common DWG format, which is what tc3 to dwg conversion represents. Unfortunately, we have not found any alternative software for this, but perhaps if you find someone that owns the software, they can do the export for you. It's always worth a shot to reach out to the online community for help.
Updated: July 19, 2023