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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .RGF | The LEGO Group | Data Files | LEGO MINDSTORMS EV3 Robot Graphics File | LEGO MINDSTORMS EV3 | The LEGO Group |
| .RGO | Cerience Corporation | Data Files | RepliGo File | RepliGo Viewer | Cerience Corporation |
| .RGT | Relic Entertainment | Data Files | Relic Entertainment Game Texture File | Corsix's Mod Studio | Open Source |
| .RHK | Symantec Corporation | Data Files | Backdoor.Win32.Rbot.rhk Data | AVG Antivirus | AVG Technologies |
| .RI | IBM | Data Files | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .RIO | IBM | Data Files | IBM AIX System Data | IBM AIX | IBM |
| .RIP | IBM | Data Files | Lotus Notes Error File | IBM Lotus Notes | IBM |
| .RIR | APNIC | Data Files | RIR Statistics Exchange Format Data | RIR Explorer | APNIC |
| .RIV | Open Source | Data Files | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .RL | R.LAB | Data Files | R.viewer List File | R.viewer | R.LAB |
| .RLELZW | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RLG | ReliaSoft | Data Files | ReliaSoft Weibull++ Data | ReliaSoft Weibull++ | ReliaSoft |
| .RLL | Microsoft Corporation | Data Files | Microsoft Resource Library | Microsoft Visual Studio | Microsoft Corporation |
| .RLO | Unknown Developer | Data Files | Basic Realizer Careal Library File | Unknown Software | Unknown Developer |
| .RLT | ReliaSoft | Data Files | ReliaSoft BlockSim & Weibull++ Data | ReliaSoft Weibull++ | ReliaSoft |
| .RLV | Tacx | Data Files | Tacx Fortius File | Fortius VR Trainer | Tacx |
| .RLZ | CA Technologies | Data Files | Basic CA-Realizer File | CA-Realizer | CA Technologies |
| .RM5 | Cochrane Community | Data Files | RevMan Review File | RevMan | Cochrane Community |
| .RMB | SCRIPTMATION | Data Files | RegistryMaster Data File | RegistryMaster | SCRIPTMATION |
| .RMC | WSDOT | Data Files | RMCalc Data | RMCalc | WSDOT |
| .RMD | Thomson Reuters Corporation | Data Files | Reference Manager Data File | Reference Manager | Thomson Reuters Corporation |
| .RMGB | RootsMagic, Inc. | Data Files | RootsMagic V4 Database Backup | RootsMagic | RootsMagic, Inc. |
| .RMGC | RootsMagic, Inc. | Data Files | RootsMagic V4 Genealogy Database | RootsMagic | RootsMagic, Inc. |
| .RMH | Microsoft Corporation | Data Files | Rights-Managed HTML Document File | Internet Explorer | Microsoft Corporation |
| .RMK | Grafx Software Development Tools | Data Files | CA Clipper RMake Makefile | CA-Clipper | CA Technologies |
| .RMX | RealNetworks | Data Files | RealJukebox Format | RealPlayer Cloud | RealNetworks |
| .RN | Nota Bene | Data Files | Nota Bene XPL Program | Nota Bene | Nota Bene |
| .RNG | Nokia | Data Files | Nokia Composer Ringtone | Nokia PC Suite | Nokia |
| .ROD | RIB Software | Data Files | RIB Office Database File | RIB office | RIB Software |
| .ROF | Autodesk, Inc. | Data Files | Autodesk Storm & Sanitary Analysis Data | Storm & Sanitary Analysis | Autodesk, Inc. |
| .ROFF | AT&T Labs | Data Files | Unformatted Manual Page | Unix | AT&T Labs |
| .ROI | Actuate Corporation | Data Files | Report Object Instance | Actuate Information Object Designer | Actuate Corporation |
| .ROK | Roku, Inc. | Data Files | Roku Update File | Roku Digital Media Player Devices | Roku, Inc. |
| .ROOT | CERN | Data Files | ROOT Data | ROOT | CERN |
| .ROS | Jon Taylor | Data Files | BattleScribe Roster Editor File | BattleScribe | Jon Taylor |
| .ROU | Gerber Technology | Data Files | Gerber Route File | Altium Designer | Altium |
| .ROUT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROUTINES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROW | Digital Rowing | Data Files | RowPro Rowfile | RowPro | Digital Rowing |
| .ROX | Sonic Solutions | Data Files | Roxio Project File | Roxio Creator NXT Pro 6 | Roxio |
| .ROZ | aSc Applied Software Consultants | Data Files | aSc TimeTables Schedule File | aSc TimeTables | aSc Applied Software Consultants |
| .RP | Axure | Data Files | Axure RP Project File | Axure RP | Axure |
| .RP0 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP1 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP2 | Cloanto Corporation | Data Files | RetroPlatform Player Program Archive | Amiga Forever | Cloanto Corporation |
| .RP4 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP5 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP6 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP8 | RescuePro Production GbR | Data Files | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RPA | RIB Software | Data Files | RIB Project Archive File | iTWO | RIB Software |
| .RPC | Synthrone | Data Files | Rich Page Content Document | Synthrone Crafter | Synthrone |
| .RPD | RIB Software | Data Files | RIB Project Database File | iTWO | RIB Software |
| .RPE | Oracle Corporation | Data Files | Performance Analyzer Data | Performance Analyzer | Oracle Corporation |
| .RPH | STORMWARE | Data Files | Sestava POHODA File | Report Designer | STORMWARE |
| .RPJ | Uni Comp | Data Files | Real Pac Batch Job File | Real Pac | Uni Comp |
| .RPN | Swiftpage, Inc. | Data Files | ACT! Report Data | Act! | Swiftpage, Inc. |
| .RPP | Cockos Incorporated | Data Files | REAPER Project | REAPER | Cockos Incorporated |
| .RPT | SAP | Data Files | Crystal Reports File | Microsoft Visual Studio | Microsoft Corporation |
| .RPTR | Open Source | Data Files | RafflePrinter Document | RafflePrinter | Open Source |
| .RPW | Dalesplace | Data Files | RPWiz Project File | RPWiz | Dalesplace |
| .RQ | Open Source | Data Files | SPARQL Query | D2RQ Platform | Open Source |
| .RRA | Iterum, LLC | Data Files | vRigger Rigging Gear File | Iterum vRigger | Iterum, LLC |
| .RRB | Wizards of the Coast | Data Files | RoboRally Board Editor Board File | RoboRally Board Editor | Wizards of the Coast |
| .RRF | FLIR Systems | Data Files | Musicmatch Jukebox File | Raymarine RayTech RNS Navigation Software | FLIR Systems |
| .RRI | Astronomical Institute of the Czech Academyof Sciences | Data Files | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RRT | ALTAVENTE | Data Files | Rhapzode Resource Template | Microsoft PowerPoint | Microsoft Corporation |
| .RRW | Ivanti | Data Files | Goldmine Report File | GoldMine | Ivanti |
| .RSB | ReliaSoft | Data Files | ReliaSoft BlockSim File | ReliaSoft BlockSim | HBM PRENSCIA INC. |
| .RSC | Nokia | Data Files | Symbian Application Compiled Resource File | Nokia Carbide.c++ | Nokia |
| .RSD | Rosetta Stone | Data Files | Rosetta Stone Data File | Rosetta Stone Language Learning | Rosetta Stone |
| .RSE | Apogee Components | Data Files | RockSim Engine Database | RockSim | Apogee Components |
| .RSF | EaseUS | Data Files | Recovery State File | Data Recovery Wizard | EaseUS |
| .RSK | Interscape | Data Files | RiskMan Risk Project File | RiskMan | Interscape |
| .RSL | Corel Corporation | Data Files | Corel Paradox Saved Form File | Corel Paradox | Corel |
| .RSM | RouterSim | Data Files | RouterSim Network Visualizer File | RouterSim CCNA Network Visualizer | RouterSim |
| .RSP | Rockwell Automation Inc. | Data Files | RSLogix PLC Program File | RSLogix 5 | Rockwell Automation Inc. |
| .RSS | Various Developers | Data Files | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RSV | Rockwell Automation Inc. | Data Files | RSView32 Project File | RSView32 | Rockwell Automation Inc. |
| .RSW | Liveware Publishing | Data Files | R&R SQL Report Writer Report File | R&R ReportWorks | Liveware Publishing |
| .RTA | Adobe Systems Incorporated | Data Files | RoboHelp RTA Data File | Adobe RoboHelp | Adobe Systems Incorporated |
| .RTC | Brain Innovation | Data Files | BrainVoyager QX Design Matrix File | BrainVoyager QX | Brain Innovation |
| .RTE | Autodesk, Inc. | Data Files | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RTH | ANSYS, Inc. | Data Files | ANSYS Results File | ANSYS DesignModeler | ANSYS, Inc. |
| .RTK | Adobe Systems Incorporated | Data Files | Adobe RoboHelp Configuration File | Adobe RoboHelp | Adobe Systems Incorporated |
| .RTM | Unknown Developer | Data Files | Real Tracker Module | Real Tracker | Unknown Developer |
| .RTP | KTH Royal Institute of Technology | Data Files | Gromacs Residue Topology Parameter File | Gromacs | KTH Royal Institute of Technology |
| .RTR | Fantiusen Software | Data Files | Astrotite 200X Offline Data Repair File Format | Astrotite | Fantiusen Software |
| .RTT | RagTime.de Development | Data Files | Ragtime File | RagTime | RagTime.de Development |
| .RT_ | Microsoft Corporation | Data Files | Microsoft WinHelp Compressed Help Document | Microsoft Windows Help | Microsoft Corporation |
| .RUBY | Yukihiro “Matz” Matsumoto | Data Files | Ruby File | Ruby | Yukihiro “Matz” Matsumoto |
| .RUF | Samsung Electronics | Data Files | Samsung DVD And Blu-ray Player Firmware File | Windows Built-in USB Drive Software | Microsoft Corporation |
| .RUJ | Oracle Corporation | Data Files | Oracle Recovery-Unit Journal File Format | Oracle Database | Oracle Corporation |
| .RUL | Flexera Software | Data Files | InstallShield Rules File | InstallShield | Flexera Software |
| .RUP | IBM | Data Files | IBM Rational Unified Process Data | Rational Method Composer | IBM |
| .RUS | Sublime HQ Pty Ltd | Data Files | Russian Text Or Localization Data | Sublime Text | Sublime HQ Pty Ltd |
| .RV | Astronomical Institute of the Czech Academyof Sciences | Data Files | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RV3 | Open Source | Data Files | Newsbin Pro Data | DJI Interprises NewsBin Pro | Open Source |
| .RV4 | HC Sharp Software | Data Files | Taxpayer Data File | 1040 Review | HC Sharp Software |
| .RVC | MicroImages | Data Files | TNTmips Windows Version Project File | TNTmips | MicroImages |
| .RVE | Ampersand Design | Data Files | Resolve-It Data File | Resolve-It | Ampersand Design |
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