This article explains what an X_T file is and how to open it on your computer.
How to open Parasolid XT file in NX 10
A file with the file extension X_T is a Parasolid model part file. They are also known as Modeller Transmit files.
Several CAD programs can export to and import from the X_T format. The files are text-based and essentially consist of numbers, which some CAD programs can read to identify the geometry, color, and other details of the 3D model.
Parasolid model parts saved in binary format are saved with the file extension X_B. Older versions of the X_T format were XMT_TXT and XMP_TXT.
