| .R01 | Various Developers | Gegevensbestanden | WinRAR Split Archive Part 1 | 7-Zip | Igor Pavlov |
| .R1W | Micro Focus International plc | Gegevensbestanden | Reflection Settings | Reflection software | Micro Focus International plc |
| .R2W | Micro Focus International plc | Gegevensbestanden | Reflection Settings | Reflection software | Micro Focus International plc |
| .R5 | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .R8 | Unknown Developer | Gegevensbestanden | RAW Graphics File | Unknown Software | Unknown Developer |
| .RA6 | ReliaSoft | Gegevensbestanden | ReliaSoft ALTA 6 File | ReliaSoft ALTA | HBM PRENSCIA INC. |
| .RAB | Pearson | Gegevensbestanden | Encyclopedia Britannica 2002 Deluxe Edition Data | Encyclopedia Britannica 2002 Deluxe Edition | Pearson |
| .RAC | Concept2 Inc. | Gegevensbestanden | Venue Race Application File Format | Venue Race Application | Concept2 Inc. |
| .RAI | Astronomical Institute of the Czech Academyof Sciences | Gegevensbestanden | SPEFO Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RAN | Owen F. Ransen | Gegevensbestanden | Dexterpen File | Dexterpen | Owen F. Ransen |
| .RAR | Rocky Sand Studio | Gegevensbestanden | WinRAR Compressed Archive | 7-Zip | Igor Pavlov |
| .RAT | World Wide Web Consortium (W3C) | Gegevensbestanden | PICS Rating File | Microsoft Notepad | Microsoft Corporation |
| .RBD | Jdobbs Software | Gegevensbestanden | DVD Rebuilder File | DVD Rebuilder | Jdobbs Software |
| .RBG | Just Great Software | Gegevensbestanden | RegexBuddy GREP Action Data | Regexbuddy | Just Great Software |
| .RBI | Robert Bentley, Inc. | Gegevensbestanden | eBahn Reader Data | eBahn Desktop | Robert Bentley, Inc. |
| .RBL | Just Great Software | Gegevensbestanden | RegexBuddy Library File | Regexbuddy | Just Great Software |
| .RBO | Xojo, Inc | Gegevensbestanden | REALbasic Class File | Xojo | Xojo, Inc |
| .RBT | The LEGO Group | Gegevensbestanden | LEGO MINDSTORMS NXT Program | LEGO MINDSTORMS NXT | The LEGO Group |
| .RCB | RealityRipple Software | Gegevensbestanden | Ripple Chat Bot Document File | Ripple Chat Bot | RealityRipple Software |
| .RCD | Symantec Corporation | Gegevensbestanden | PcAnywhere Recorded Session File | pcAnywhere | Symantec Corporation |
| .RCF | Rhapsody International | Gegevensbestanden | Audiogalaxy Rhapsody Storage File | Rhapsody | Rhapsody International |
| .RCG | Neil Fraser | Gegevensbestanden | Recog Character Recognition Set | Recog | Neil Fraser |
| .RCH | Grassland, Soil and Water Research Laboratory | Gegevensbestanden | SWAT Reach Output File | SWAT | Grassland, Soil and Water Research Laboratory |
| .RCK | Building Energy Codes | Gegevensbestanden | REScheck Data File | REScheck | Building Energy Codes |
| .RCM | Faithlife | Gegevensbestanden | Logos Library System Verse Map | Unknown Software | Unknown Developer |
| .RCX | The LEGO Group | Gegevensbestanden | Lego Mindstorms Data | LEGO MINDSTORMS NXT | The LEGO Group |
| .RC_ | Microsoft Corporation | Gegevensbestanden | Microsoft WinHelp Compressed Help Document | Microsoft Windows Help | Microsoft Corporation |
| .RD1 | DATAIR | Gegevensbestanden | DATAIR Data File | DATAIR Pension Reporter | DATAIR |
| .RDA | Open Source | Gegevensbestanden | R Data File | R | The R Foundation |
| .RDATA | The R Foundation | Gegevensbestanden | R Workspace File | R | The R Foundation |
| .RDB | EMC | Gegevensbestanden | Retrospect Backup Set | Retrospect | Retrospect Inc. |
| .RDC | IBM | Gegevensbestanden | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .RDD | ReliaSoft | Gegevensbestanden | ALTA File | ReliaSoft ALTA | HBM PRENSCIA INC. |
| .RDF | Unknown Developer | Gegevensbestanden | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .RDH | Siemens AG | Gegevensbestanden | Siemens MR Spectroscopy Header Data | MR Spectroscopy | Siemens AG |
| .RDT | Adobe Systems Incorporated | Gegevensbestanden | Adobe Captivate RoboDemo Template File | Adobe Captivate | Adobe Systems Incorporated |
| .RDV | Nikolai Teofilov | Gegevensbestanden | NTgraph Data | NTgraph | Nikolai Teofilov |
| .RDX | Borland | Gegevensbestanden | Reflex Data File | Borland Reflex | Borland |
| .READ | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REASON | Propellerhead | Gegevensbestanden | REASON File | Reason | Propellerhead |
| .REB | REBOL Technologies | Gegevensbestanden | REBOL Script File | REBOL/View | REBOL Technologies |
| .REC | TOPFIELD Co., Ltd. | Gegevensbestanden | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .REF | Clark Labs | Gegevensbestanden | IDRISI Raster Image Reference File | GDAL | Open Source |
| .REFERENCE | Budget In Brief | Gegevensbestanden | Budget In Brief Reference File | Microsoft Notepad | Microsoft Corporation |
| .REGISTER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REL | Nintendo | Gegevensbestanden | Relocatable Module File | Stage Switcher | Unknown Developer |
| .RELEASE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REMOVE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REO | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .REP | Rockstar Games | Gegevensbestanden | Grand Theft Auto Replay File | Grand Theft Auto III | Rockstar Games |
| .REPORT | Sublime HQ Pty Ltd | Gegevensbestanden | Report File | Microsoft Notepad | Microsoft Corporation |
| .REPORTS | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REQU | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REQUEST | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RESCUE | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .RESPECT | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RET | SAP | Gegevensbestanden | BusinessObjects Template | SAP BusinessObjects Business Intelligence | SAP |
| .REUNION | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REVE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REWARD | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .REX | Propellerhead | Gegevensbestanden | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .REZ | Monolith Productions | Gegevensbestanden | Lithtech Game Engine Resource File | Dragon UnPACKer | Open Source |
| .REZCODE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RF | Adobe Systems Incorporated | Gegevensbestanden | Adobe FrameMaker Document | Adobe FrameMaker | Adobe Systems Incorporated |
| .RFA | Autodesk, Inc. | Gegevensbestanden | Revit Family File | AutoCAD Architecture | Autodesk, Inc. |
| .RFI | Astronomical Institute of the Czech Academyof Sciences | Gegevensbestanden | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RFL | Propellerhead | Gegevensbestanden | Reason ReFill Sound Bank File | Reason | Propellerhead |
| .RFO | Siber Systems | Gegevensbestanden | RoboForm Option File | RoboForm | Siber Systems |
| .RFR | Adobe Systems Incorporated | Gegevensbestanden | Adobe Photoshop Frame Filter | Adobe Photoshop | Adobe Systems Incorporated |
| .RFU | Hewlett-Packard | Gegevensbestanden | Remote Firmware Update | HP Remote Firmware Update | Hewlett-Packard |
| .RFX | Unknown Developer | Gegevensbestanden | TouchStar License | Unknown Software | Unknown Developer |
| .RGA | Unknown Developer | Gegevensbestanden | Residual Gas Analyzer Data File | Unknown Software | Unknown Developer |
| .RGE | Microsoft Corporation | Gegevensbestanden | Entourage File Archive | Microsoft Outlook 2016 | Microsoft Corporation |
| .RGF | The LEGO Group | Gegevensbestanden | LEGO MINDSTORMS EV3 Robot Graphics File | LEGO MINDSTORMS EV3 | The LEGO Group |
| .RGO | Cerience Corporation | Gegevensbestanden | RepliGo File | RepliGo Viewer | Cerience Corporation |
| .RGT | Relic Entertainment | Gegevensbestanden | Relic Entertainment Game Texture File | Corsix's Mod Studio | Open Source |
| .RHK | Symantec Corporation | Gegevensbestanden | Backdoor.Win32.Rbot.rhk Data | AVG Antivirus | AVG Technologies |
| .RI | IBM | Gegevensbestanden | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .RIO | IBM | Gegevensbestanden | IBM AIX System Data | IBM AIX | IBM |
| .RIP | IBM | Gegevensbestanden | Lotus Notes Error File | IBM Lotus Notes | IBM |
| .RIR | APNIC | Gegevensbestanden | RIR Statistics Exchange Format Data | RIR Explorer | APNIC |
| .RIV | Open Source | Gegevensbestanden | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .RL | R.LAB | Gegevensbestanden | R.viewer List File | R.viewer | R.LAB |
| .RLELZW | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RLG | ReliaSoft | Gegevensbestanden | ReliaSoft Weibull++ Data | ReliaSoft Weibull++ | ReliaSoft |
| .RLL | Microsoft Corporation | Gegevensbestanden | Microsoft Resource Library | Microsoft Visual Studio | Microsoft Corporation |
| .RLO | Unknown Developer | Gegevensbestanden | Basic Realizer Careal Library File | Unknown Software | Unknown Developer |
| .RLT | ReliaSoft | Gegevensbestanden | ReliaSoft BlockSim & Weibull++ Data | ReliaSoft Weibull++ | ReliaSoft |
| .RLV | Tacx | Gegevensbestanden | Tacx Fortius File | Fortius VR Trainer | Tacx |
| .RLZ | CA Technologies | Gegevensbestanden | Basic CA-Realizer File | CA-Realizer | CA Technologies |
| .RM5 | Cochrane Community | Gegevensbestanden | RevMan Review File | RevMan | Cochrane Community |
| .RMB | SCRIPTMATION | Gegevensbestanden | RegistryMaster Data File | RegistryMaster | SCRIPTMATION |
| .RMC | WSDOT | Gegevensbestanden | RMCalc Data | RMCalc | WSDOT |
| .RMD | Thomson Reuters Corporation | Gegevensbestanden | Reference Manager Data File | Reference Manager | Thomson Reuters Corporation |
| .RMGB | RootsMagic, Inc. | Gegevensbestanden | RootsMagic V4 Database Backup | RootsMagic | RootsMagic, Inc. |
| .RMGC | RootsMagic, Inc. | Gegevensbestanden | RootsMagic V4 Genealogy Database | RootsMagic | RootsMagic, Inc. |
| .RMH | Microsoft Corporation | Gegevensbestanden | Rights-Managed HTML Document File | Internet Explorer | Microsoft Corporation |
| .RMK | Grafx Software Development Tools | Gegevensbestanden | CA Clipper RMake Makefile | CA-Clipper | CA Technologies |
| .RMX | RealNetworks | Gegevensbestanden | RealJukebox Format | RealPlayer Cloud | RealNetworks |
| .RN | Nota Bene | Gegevensbestanden | Nota Bene XPL Program | Nota Bene | Nota Bene |
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