Both .dcd and .dw2 files come from a 2D/3D CAD software DesignCAD and this is pretty much the only software that can be used to convert or export these software specific technical drawings. We have not found any particular information about dcd to dw2 conversion, so if you struggle with particular problem or have some specific issue with such export, it would be perhaps best to consult DesignCAD technical forums or contact their support. But as far as we know, no 3rd party converter for DesignCAD exists.
Updated: July 21, 2023