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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .X3DB | Web3D Consortium | CAD Files | X3D Binary Format | X3D | Web3D Consortium |
| .XAS | Parametric Technology Corporation | CAD Files | PTC Pro/Engineer Assembly File | Pro/ENGINEER | PTC |
| .XGL | Siemens PLM Software | CAD Files | XGL 3D CAD Model | AVEVA PDMS | AVEVA Group plc |
| .XISE | Xilinx, Inc. | CAD Files | Xilinx ISE Project File | ISE Design Suite | Xilinx, Inc. |
| .XLO | Autodesk, Inc. | CAD Files | Autodesk Inventor Export Journal Data | Autodesk Inventor | Autodesk, Inc. |
| .XMT_TXT | Siemens PLM Software | CAD Files | Parasolid CAD Format | Parasolid | Siemens PLM Software |
| .XSP | Open Source | CAD Files | Kodi Smart Playlist File | Kodi | Open Source |
| .XTR | SourceForge | CAD Files | XTrkCad Demo File | XTrackCAD | SourceForge |
| .XVL | Lattice Technology, Inc. | CAD Files | eXtensible Virtual World Description Language File | XVL Player | Lattice Technology, Inc. |
| .X_B | Siemens PLM Software | CAD Files | Parasolid Model (binary) | Parasolid | Siemens PLM Software |
| .X_T | Siemens PLM Software | CAD Files | Parasolid Model Part File | Autodesk Fusion 360 | Autodesk, Inc. |
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