File created by Parasolid, a CAD geometric modeling program; contains 3D model data such as geometry, topology, and color; designed as a standard export format for sharing Parasolid CAD models; saved in text format and can be exported and imported using a variety of other CAD programs. X_T files are used in place of older version XMT_TXT and XMP_TXT files. .X_B files, while less common than X_T files, store the same data but in binary format. X_T files are used by the standard, Translators, and Bodyshop editions of Parasolid.