The Parasolid file format (.x_t, .x_b, .xmt_txt, .xmt_bin) is a geometric modeling kernel format widely used in CAD/CAM/CAE software. It's a proprietary format developed by Siemens PLM Software. Parasolid files store 3D solid models, representing the geometry and topology of parts and assemblies. The format supports a wide range of geometric entities, including curves, surfaces, solids, and assemblies. It's known for its robustness and accuracy in representing complex shapes. Parasolid is often used as a neutral format for exchanging 3D models between different CAD systems, ensuring data integrity and minimizing translation errors. The format exists in both text (.x_t, .xmt_txt) and binary (.x_b, .xmt_bin) versions, with the binary format offering smaller file sizes and faster read/write speeds. Parasolid is a core component in many commercial CAD systems, providing the underlying geometric engine for creating and manipulating 3D models. Its widespread adoption makes it a crucial format for interoperability in the engineering and manufacturing industries. The 'xmt' variations are often associated with material properties and textures.