x_b to dwg conversion covers export of Parasolid models to DWG format, something that should be actually possible with pretty much any tool that supports Parasolid formats, including Parasolid itself of course. Latest versions of AutoCAD mechanical supposedly support import of .x_b and .x_t files directly, without the need to export the file first, before importing it to AutoCAD.
Updated: July 28, 2023