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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .L2D | Cadwork SA | CAD Files | Cadwork File | Cadwork | Cadwork SA |
| .LAY6 | ABACOM | CAD Files | Sprint-Layout Document | Sprint-Layout | ABACOM |
| .LCF | Graphisoft | CAD Files | ArchiCAD Library Container File | ARCHICAD | Graphisoft |
| .LDT | DIAL | CAD Files | Eulumdat Formatted Luminaire Data File | DIAL DIALux | DIAL |
| .LEG | Interscape | CAD Files | LEGOCAD File | LEGOCAD | Interscape |
| .LIN | Autodesk, Inc. | CAD Files | AutoCAD Linetype File | Autodesk AutoCAD | Autodesk, Inc. |
| .LK# | Autodesk, Inc. | CAD Files | Autodesk Multi-User Coordination Lock Data | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .LY+ | DataCAD LLC | CAD Files | DataCAD Plus Layer File | DataCAD | DataCAD LLC |
| .LYC | SPGPrints Group | CAD Files | BestIMAGE Compressed Design File | spgprints bestIMAGE | SPGPrints Group |
| .LYR | ESRI | CAD Files | ArcView Layer File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
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