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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .RCD | Symantec Corporation | CAD Files | PcAnywhere Recorded Session File | pcAnywhere | Symantec Corporation |
| .RDF | Unknown Developer | CAD Files | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .RED | Tailor Made Software | CAD Files | CADViewer Redline Markup File | Tailor Made CADViewer | Tailor Made Software |
| .RIG | Iterum, LLC | CAD Files | vRigger Design File | Iterum vRigger | Iterum, LLC |
| .RLC | ESRI | CAD Files | ArcView Image | ArcView | ESRI |
| .RML | Autodesk, Inc. | CAD Files | Redline Markup Language File | Volo View | Autodesk, Inc. |
| .ROC | Andreas Firnau | CAD Files | SpaceCAD Rocket Design | SpaceCAD | Andreas Firnau |
| .RPF | Rockstar Games | CAD Files | Grand Theft Auto Data File | Grand Theft Auto IV | Rockstar Games |
| .RRA | Iterum, LLC | CAD Files | vRigger Rigging Gear File | Iterum vRigger | Iterum, LLC |
| .RSM | RouterSim | CAD Files | RouterSim Network Visualizer File | RouterSim CCNA Network Visualizer | RouterSim |
| .RTD | Autodesk, Inc. | CAD Files | Robot Structural Analysis Design File | Robot Structural Analysis Professional | Autodesk, Inc. |
| .RTE | Autodesk, Inc. | CAD Files | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RVD | Softelec | CAD Files | VPHybridCAD Native Drawing | VPHybridCAD | Softelec |
| .RVT | Autodesk, Inc. | CAD Files | Revit Project File | AutoCAD Architecture | Autodesk, Inc. |
| .RXL | Seetrax CAE Ltd | CAD Files | Seetrax Ranger CAD Drawing File | Ranger XL | Seetrax CAE Ltd |
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