slddrw to x_t conversion is related to the export of SolidWorks content to Parasolid format, something that is certainly doable, just not with every 3D tool. This is mainly due to the fact that both formats are proprietary, and their licenses are most likely not free. Support for Parasolid is often added via third-party plugin, so you can always check out whether there is one available for your 3D solid modeler software tool.
Updated: February 7, 2024