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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .RDC | IBM | GIS Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .RDF | Unknown Developer | GIS Files | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .REF | Clark Labs | GIS Files | IDRISI Raster Image Reference File | GDAL | Open Source |
| .RESP | IRIS | GIS Files | IRIS RESP File | rdseed | IRIS |
| .RGN | Garmin | GIS Files | Garmin Regional Data File | MapInstall | Garmin |
| .RIK | Open Source | GIS Files | SharpMap File | SharpMap | Open Source |
| .RMP | RealNetworks | GIS Files | RealPlayer Metadata Package File | Apple iTunes | Apple |
| .RRD | Unknown Developer | GIS Files | Reduced Resolution Dataset File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .RST | David Goodger | GIS Files | ReStructuredText File | Microsoft Notepad | Microsoft Corporation |
| .RTE | Autodesk, Inc. | GIS Files | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RTX | The Document Foundation | GIS Files | Rich Text Document | LibreOffice | The Document Foundation |
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