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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .NC | CNC Software | CAD Files | Mastercam Numerical Control File | Mastercam | CNC Software |
| .NC1 | CNC Software | CAD Files | Mastercam Numerical Control File | Mastercam | CNC Software |
| .NCZ | Netcad | CAD Files | Netcad Drawing | Netcad | Netcad |
| .NEU | Parametric Technology Corporation | CAD Files | Pro/ENGINEER Neutral File | Creo Parametric 3D Modeling Software | PTC |
| .NGD | Xilinx, Inc. | CAD Files | Xilinx Netlist File | ISE Design Suite | Xilinx, Inc. |
| .NPL | Nokia | CAD Files | Nokia Playlist File | Nokia Multimedia Player | Nokia |
| .NWC | NoteWorthy Software | CAD Files | NoteWorthy Composer File | NoteWorthy Composer | NoteWorthy Software |
| .NWD | Autodesk, Inc. | CAD Files | Navisworks Document | Navisworks | Autodesk, Inc. |
| .NWF | Autodesk, Inc. | CAD Files | Navisworks File Set | Navisworks | Autodesk, Inc. |
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