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| Estensione | Sviluppatore del Tipo di File | Categoria File | Descrizione del Tipo di File | Software Principale | Sviluppatore del Software Primario |
|---|---|---|---|---|---|
| .RAD | Reality Pump Studios | File di testo | Reality Adlib Tracker Module | Adlib Tracker II | Adlib Tracker II |
| .RCJ | Microsoft Corporation | File di testo | Robocopy Job File | Microsoft Notepad | Microsoft Corporation |
| .RD | Sublime HQ Pty Ltd | File di testo | R Document File | Sublime Text | Sublime HQ Pty Ltd |
| .RDF | Unknown Developer | File di testo | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .REA | Microsoft Corporation | File di testo | Readme Text File | Microsoft Notepad | Microsoft Corporation |
| .README | The Document Foundation | File di testo | Readme Text Document File | LibreOffice | The Document Foundation |
| .RFT | Autodesk, Inc. | File di testo | Revit Family Template File | AutoCAD Architecture | Autodesk, Inc. |
| .RIS | Research Systems, Inc | File di testo | Research Information Systems Citation File | EndNote | Thomson Reuters Corporation |
| .RP1 | RescuePro Production GbR | File di testo | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP5 | RescuePro Production GbR | File di testo | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RPN | Swiftpage, Inc. | File di testo | ACT! Report Data | Act! | Swiftpage, Inc. |
| .RPT | SAP | File di testo | Crystal Reports File | Microsoft Visual Studio | Microsoft Corporation |
| .RPTDESIGN | Open Source | File di testo | BIRT Report Design | BIRT | Open Source |
| .RSP | Rockwell Automation Inc. | File di testo | RSLogix PLC Program File | RSLogix 5 | Rockwell Automation Inc. |
| .RST | David Goodger | File di testo | ReStructuredText File | Microsoft Notepad | Microsoft Corporation |
| .RTD | Autodesk, Inc. | File di testo | Robot Structural Analysis Design File | Robot Structural Analysis Professional | Autodesk, Inc. |
| .RTF | Microsoft Corporation | File di testo | Rich Text Format File | Corel WordPerfect X8 | Corel |
| .RTFD | Apple | File di testo | Rich Text Format Directory File | Apple TextEdit | Apple |
| .RTL | Hewlett-Packard | File di testo | Raster Transfer Language File | SwiftView | SwiftView, Inc. |
| .RTX | The Document Foundation | File di testo | Rich Text Document | LibreOffice | The Document Foundation |
| .RU | Microsoft Corporation | File di testo | Russian Text Or Localization File | Microsoft Notepad | Microsoft Corporation |
| .RUN | Open Source | File di testo | Linux Executable File | Linux | Open Source |
| .RVF | Interscape | File di testo | RichView Format File | TRichView | Interscape |
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