| .RNG | Nokia | Gegevensbestanden | Nokia Composer Ringtone | Nokia PC Suite | Nokia |
| .ROD | RIB Software | Gegevensbestanden | RIB Office Database File | RIB office | RIB Software |
| .ROF | Autodesk, Inc. | Gegevensbestanden | Autodesk Storm & Sanitary Analysis Data | Storm & Sanitary Analysis | Autodesk, Inc. |
| .ROFF | AT&T Labs | Gegevensbestanden | Unformatted Manual Page | Unix | AT&T Labs |
| .ROI | Actuate Corporation | Gegevensbestanden | Report Object Instance | Actuate Information Object Designer | Actuate Corporation |
| .ROK | Roku, Inc. | Gegevensbestanden | Roku Update File | Roku Digital Media Player Devices | Roku, Inc. |
| .ROOT | CERN | Gegevensbestanden | ROOT Data | ROOT | CERN |
| .ROS | Jon Taylor | Gegevensbestanden | BattleScribe Roster Editor File | BattleScribe | Jon Taylor |
| .ROU | Gerber Technology | Gegevensbestanden | Gerber Route File | Altium Designer | Altium |
| .ROUT | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROUTINES | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROW | Digital Rowing | Gegevensbestanden | RowPro Rowfile | RowPro | Digital Rowing |
| .ROX | Sonic Solutions | Gegevensbestanden | Roxio Project File | Roxio Creator NXT Pro 6 | Roxio |
| .ROZ | aSc Applied Software Consultants | Gegevensbestanden | aSc TimeTables Schedule File | aSc TimeTables | aSc Applied Software Consultants |
| .RP | Axure | Gegevensbestanden | Axure RP Project File | Axure RP | Axure |
| .RP0 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP1 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP2 | Cloanto Corporation | Gegevensbestanden | RetroPlatform Player Program Archive | Amiga Forever | Cloanto Corporation |
| .RP4 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP5 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP6 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RP8 | RescuePro Production GbR | Gegevensbestanden | RescuePro Physician Invoice File | RescuePro | RescuePro Production GbR |
| .RPA | RIB Software | Gegevensbestanden | RIB Project Archive File | iTWO | RIB Software |
| .RPC | Synthrone | Gegevensbestanden | Rich Page Content Document | Synthrone Crafter | Synthrone |
| .RPD | RIB Software | Gegevensbestanden | RIB Project Database File | iTWO | RIB Software |
| .RPE | Oracle Corporation | Gegevensbestanden | Performance Analyzer Data | Performance Analyzer | Oracle Corporation |
| .RPH | STORMWARE | Gegevensbestanden | Sestava POHODA File | Report Designer | STORMWARE |
| .RPJ | Uni Comp | Gegevensbestanden | Real Pac Batch Job File | Real Pac | Uni Comp |
| .RPN | Swiftpage, Inc. | Gegevensbestanden | ACT! Report Data | Act! | Swiftpage, Inc. |
| .RPP | Cockos Incorporated | Gegevensbestanden | REAPER Project | REAPER | Cockos Incorporated |
| .RPT | SAP | Gegevensbestanden | Crystal Reports File | Microsoft Visual Studio | Microsoft Corporation |
| .RPTR | Open Source | Gegevensbestanden | RafflePrinter Document | RafflePrinter | Open Source |
| .RPW | Dalesplace | Gegevensbestanden | RPWiz Project File | RPWiz | Dalesplace |
| .RQ | Open Source | Gegevensbestanden | SPARQL Query | D2RQ Platform | Open Source |
| .RRA | Iterum, LLC | Gegevensbestanden | vRigger Rigging Gear File | Iterum vRigger | Iterum, LLC |
| .RRB | Wizards of the Coast | Gegevensbestanden | RoboRally Board Editor Board File | RoboRally Board Editor | Wizards of the Coast |
| .RRF | FLIR Systems | Gegevensbestanden | Musicmatch Jukebox File | Raymarine RayTech RNS Navigation Software | FLIR Systems |
| .RRI | Astronomical Institute of the Czech Academyof Sciences | Gegevensbestanden | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RRT | ALTAVENTE | Gegevensbestanden | Rhapzode Resource Template | Microsoft PowerPoint | Microsoft Corporation |
| .RRW | Ivanti | Gegevensbestanden | Goldmine Report File | GoldMine | Ivanti |
| .RSB | ReliaSoft | Gegevensbestanden | ReliaSoft BlockSim File | ReliaSoft BlockSim | HBM PRENSCIA INC. |
| .RSC | Nokia | Gegevensbestanden | Symbian Application Compiled Resource File | Nokia Carbide.c++ | Nokia |
| .RSD | Rosetta Stone | Gegevensbestanden | Rosetta Stone Data File | Rosetta Stone Language Learning | Rosetta Stone |
| .RSE | Apogee Components | Gegevensbestanden | RockSim Engine Database | RockSim | Apogee Components |
| .RSF | EaseUS | Gegevensbestanden | Recovery State File | Data Recovery Wizard | EaseUS |
| .RSK | Interscape | Gegevensbestanden | RiskMan Risk Project File | RiskMan | Interscape |
| .RSL | Corel Corporation | Gegevensbestanden | Corel Paradox Saved Form File | Corel Paradox | Corel |
| .RSM | RouterSim | Gegevensbestanden | RouterSim Network Visualizer File | RouterSim CCNA Network Visualizer | RouterSim |
| .RSP | Rockwell Automation Inc. | Gegevensbestanden | RSLogix PLC Program File | RSLogix 5 | Rockwell Automation Inc. |
| .RSS | Various Developers | Gegevensbestanden | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RSV | Rockwell Automation Inc. | Gegevensbestanden | RSView32 Project File | RSView32 | Rockwell Automation Inc. |
| .RSW | Liveware Publishing | Gegevensbestanden | R&R SQL Report Writer Report File | R&R ReportWorks | Liveware Publishing |
| .RTA | Adobe Systems Incorporated | Gegevensbestanden | RoboHelp RTA Data File | Adobe RoboHelp | Adobe Systems Incorporated |
| .RTC | Brain Innovation | Gegevensbestanden | BrainVoyager QX Design Matrix File | BrainVoyager QX | Brain Innovation |
| .RTE | Autodesk, Inc. | Gegevensbestanden | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RTH | ANSYS, Inc. | Gegevensbestanden | ANSYS Results File | ANSYS DesignModeler | ANSYS, Inc. |
| .RTK | Adobe Systems Incorporated | Gegevensbestanden | Adobe RoboHelp Configuration File | Adobe RoboHelp | Adobe Systems Incorporated |
| .RTM | Unknown Developer | Gegevensbestanden | Real Tracker Module | Real Tracker | Unknown Developer |
| .RTP | KTH Royal Institute of Technology | Gegevensbestanden | Gromacs Residue Topology Parameter File | Gromacs | KTH Royal Institute of Technology |
| .RTR | Fantiusen Software | Gegevensbestanden | Astrotite 200X Offline Data Repair File Format | Astrotite | Fantiusen Software |
| .RTT | RagTime.de Development | Gegevensbestanden | Ragtime File | RagTime | RagTime.de Development |
| .RT_ | Microsoft Corporation | Gegevensbestanden | Microsoft WinHelp Compressed Help Document | Microsoft Windows Help | Microsoft Corporation |
| .RUBY | Yukihiro “Matz” Matsumoto | Gegevensbestanden | Ruby File | Ruby | Yukihiro “Matz” Matsumoto |
| .RUF | Samsung Electronics | Gegevensbestanden | Samsung DVD And Blu-ray Player Firmware File | Windows Built-in USB Drive Software | Microsoft Corporation |
| .RUJ | Oracle Corporation | Gegevensbestanden | Oracle Recovery-Unit Journal File Format | Oracle Database | Oracle Corporation |
| .RUL | Flexera Software | Gegevensbestanden | InstallShield Rules File | InstallShield | Flexera Software |
| .RUP | IBM | Gegevensbestanden | IBM Rational Unified Process Data | Rational Method Composer | IBM |
| .RUS | Sublime HQ Pty Ltd | Gegevensbestanden | Russian Text Or Localization Data | Sublime Text | Sublime HQ Pty Ltd |
| .RV | Astronomical Institute of the Czech Academyof Sciences | Gegevensbestanden | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RV3 | Open Source | Gegevensbestanden | Newsbin Pro Data | DJI Interprises NewsBin Pro | Open Source |
| .RV4 | HC Sharp Software | Gegevensbestanden | Taxpayer Data File | 1040 Review | HC Sharp Software |
| .RVC | MicroImages | Gegevensbestanden | TNTmips Windows Version Project File | TNTmips | MicroImages |
| .RVE | Ampersand Design | Gegevensbestanden | Resolve-It Data File | Resolve-It | Ampersand Design |
| .RVG | Autodesk, Inc. | Gegevensbestanden | Revit External Group File | Revit | Autodesk, Inc. |
| .RVL | muvee | Gegevensbestanden | Muvee Reveal X Project File | muvee Reveal X | muvee |
| .RVT | Autodesk, Inc. | Gegevensbestanden | Revit Project File | AutoCAD Architecture | Autodesk, Inc. |
| .RVW | Element River, LLC. | Gegevensbestanden | ReviewMate Review File | ReviewMate | Element River, LLC. |
| .RW5 | Spectra Precision | Gegevensbestanden | Survey Pro Data File | Survey Pro | Spectra Precision |
| .RWA | ReliaSoft | Gegevensbestanden | Weibull++ File | ReliaSoft Weibull++ | ReliaSoft |
| .RWD | NRG Systems | Gegevensbestanden | NRG Raw Wind Data File | Symphonie Data Retriever | NRG Systems |
| .RWG | Gammadyne Corp | Gegevensbestanden | Random Word Generator Project File | Gammadyne Random Word Generator | Gammadyne Corp |
| .RWS | Ludeon Studios | Gegevensbestanden | RimWorld Game Save File | Ludeon Studios RimWorld | Ludeon Studios |
| .RWX | AOL | Gegevensbestanden | Netscape Live 3D File | Netscape Navigator | NetScape |
| .RX | Microsoft Corporation | Gegevensbestanden | MS-DOS 7 Data | Microsoft Windows | Microsoft Corporation |
| .RXC | Sonic Solutions | Gegevensbestanden | Roxio Certificate File | Roxio Creator NXT Pro 6 | Roxio |
| .RXF | Resort Software | Gegevensbestanden | Recipe Exchange Format | Resort Recipe | Resort Software |
| .RXPROJ | ENTERBRAIN, INC. | Gegevensbestanden | RPG Maker Project | RPG Maker VX | ENTERBRAIN, INC. |
| .RXS | Remedy Interactive, Inc. | Gegevensbestanden | RSIGuard RSIScript File | RSIGuard | Remedy Interactive, Inc. |
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