| Extension | Information |
| R | Macintosh Resource Similar to RC |
| R | Paradox File |
| R | Pegasus Mail Resource File (David Harris) |
| R | Progress Database Compiled Program File (Progress Software) |
| R | Ratfor FORTRAN Preprocessor File |
| R | Rebol Script |
| R00 | WinRAR Split Compressed Archive (RarLab) |
| R01 | WinRAR Split Compressed Archive (RarLab) |
| R02 | WinRAR Split Compressed Archive (RarLab) |
| R03 | WinRAR Split Compressed Archive (RarLab) |
| R04 | WinRAR Split Compressed Archive (RarLab) |
| R05 | WinRAR Split Compressed Archive (RarLab) |
| R06 | WinRAR Split Compressed Archive (RarLab) |
| R07 | WinRAR Split Compressed Archive (RarLab) |
| R08 | WinRAR Split Compressed Archive (RarLab) |
| R09 | WinRAR Split Compressed Archive (RarLab) |
| R1A | Yamaha RM1x Dance-Music Workstation |
| R1M | RealOne Metadata Package (RealNetworks) |
| R1W | Reflection Setting File (WRQ) |
| R2A | Yamaha RS7000 Music Production Studio Sequencer |
| R2A | RS7000 All Data (Yahama Corporation) |
| R2D | Reflex Ver. 2 Data File (Borland Software Corporation) |
| R2D | RISA-2D Simple Analysis & Design |
| R2K | Repertoire 2000 Music Database |
| R2P | Yamaha RS7000 Music Production Studio Sequencer |
| R2P | RS7000 Pattern Data (Yahama Corporation) |
| R2S | RS7000 Song Data (Yahama Corporation) |
| R2W | Reflection Setting File (WRQ) |
| R3A | Yamaha RS7000 Music Production Studio Sequencer |
| R3A | RS7000 Sample Data (Yahama Corporation) |
| R3D | RISA-3D 3D Analysis & Design |
| R3D | Raider3D Image File (OKYZ SA) |
| R3D | Realsoft 3D Image (Realsoft Graphics Oy) |
| R3P | Yamaha RS7000 Music Production Studio Sequencer |
| R3P | RS7000 Sample Data (Yahama Corporation) |
| R4W | Reflection Setting File (WRQ) |
| R64 | Top Secret Crypto Gold Transformed E-mail File (TAN$TAAFL Software Company) |
| R8 | Flight Simulator Texture File |
| R8 | PictureMaker Red Channel Image Data (Cubicomp) |
| R8 | RAW Graphic File |
| R81 | Flight Simulator Texture File (Microsoft) |
| R82 | Flight Simulator Texture File (Microsoft) |
| R8L | LaserJet Landscape Font |
| R8P | Intellifont PCL 4 Bitmap Font File |
| R8P | LaserJet Portrait Font |
| RA | RealMedia Streaming Media (Real Networks, Inc.) |
| RA | Remote Access Data File |
| RA3 | RA3DIO Terrain Information (xeraina GmbH) |
| RA6 | ReliaSoft ALTA 6 |
| RAC | Conversation with Racter |
| RAC | Win2020 Screen Subtitle (Screen Subtitling Systems) |
| RAD | Radiance Scene Description Format |
| RAD | Reality AdLib Tracker 2-op FM Music |
| RAF | Illum Source RK File |
| RAF | Fuji CCD-RAW Graphic File (Fuji Photo Film U.S.A., Inc.) |
| RAI | SPEFO Stellar Spectra Analysis File |
| RAL | Right Track Layout File (Atlas Model Railroad Co., Inc.) |
| RAM | RealMedia Metafile (RealNetworks, Inc.) |
| RAN | Dexterpen File |
| RAP | Magix Musstu Rap File |
| RAP | RapAnalyst Knowledge Filter file (Raptor International) |
| RAP | Rapidocs Document |
| RAP | Redox DAS Plug-in (REDOX d.o.o.) |
| RAP | RunAs Professional Configuration (MAST Hard- & Software / MAST Webdesign) |
| RAP | Scientific Workplace Wrap File (MacKichan Software, Inc.) |
| RAQ | Colbalt Server Backup |
| RAR | Java JCA Resource Adapter Module (Sun) |
| RAR | WinRAR Compressed Archive (RarLab) |
| RARENX | egis Encrypted RAR File (HiTRUST Inc.) |
| RAS | Cals Raster File |
| RAS | Max Payne Data File (Rockstar Games) |
| RAS | Sky Subtracted Data |
| RAS | Sun Raster Graphic (Sun) |
| RASMOL | RasMol File |
| RASMOLRC | RasMol Configuration File |
| RAST | Sun Raster Graphic |
| RAT | Nimbus 7 SAMS Data File |
| RAT | Rating System File |
| RAT | RATS Data |
| RAT | Recreational Software Advisory Council |
| RATDVD | RatDVD DVD Image |
| RAV | Fifa 2001 Environment Data |
| RAW | Image Alchemy HSI Temporary Raw Bitmap |
| RAW | Nimbus 7 SAMS Data File |
| RAW | Raw Data for CD-ROM Writing |
| RAW | RAW RGB 24-bit Graphic |
| RAW | Raw Signed PCM Data |
| RAW | RealAudio Sound |
| RAW | Sentry 2020 Encryption File |
| RAW | Spectrum Raw Memory Dump |
| RAW | V41/eV41 Program Files |
| RAW | VitaGraph File |
| RAW | Nicolet Summit/DaStar Data File (Nicolet Instrument Technologies, Inc.) |
| RAW | RDosPlay RAW Audio Format |
| RAX | Extended RAW Triangles |
| RAX | RealMedia Streaming File (Real Networks, Inc.) |
| RAY | Rayshade |
| RB | RocketEdition eBook File (Gemstar eBook) |
| RB | Ruby on Rails Class File (Ruby on Rails Project) |
| RB | REALbasic Project (REAL Software, Inc.) |
| RB0 | Anti-Virus Backup |
| RB1 | Anti-Virus Backup |
| RB1 | R:Base Data (R:BASE Technologies, Inc.) |
| RB2 | Anti-Virus Backup |
| RB2 | R:Base Data (R:BASE Technologies, Inc.) |
| RB3 | Anti-Virus Backup |
| RB3 | R:Base Data (R:BASE Technologies, Inc.) |
| RB4 | Anti-Virus Backup |
| RB4 | R:Base Data (R:BASE Technologies, Inc.) |
| RB5 | Anti-Virus Backup |
| RB6 | Anti-Virus Backup |
| RB7 | Anti-Virus Backup |
| RB8 | Anti-Virus Backup |
| RB9 | Anti-Virus Backup |
| RBB | Top Secret Crypto Gold Random Bits Bin File (TAN$TAAFL Software Company) |
| RBC | Easy Resume Creator Pro Resume (Sarm Software) |
| RBF | Oracle Backup File |
| RBF | R:Base Data (R:BASE Technologies, Inc.) |
| RBF | Rollback File (Microsoft) |
| RBF | Quartus II Raw Binary File (Altera Corporation) |
| RBG | RegexBuddy GREP Action (JGsoft - Just Great Software) |
| RBH | RoboHelp Configuration |
| RBI | Adressmn |
| RBI | eBahn Reader (Bentley Publishers) |
| RBJ | XRK - eXtra Redcode Kit RedCode Warrior (Marco Pontello) |
| RBL | RegexBuddy Library (JGsoft - Just Great Software) |
| RBM | ReBirth Modulation v2.0 (Propellerhead Software) |
| RBM | Rail Baron Player Map |
| RBN | Real Sound File |
| RBN | Richard's Bridge Notation |
| RBO | Sometimes associated with the Magistr.B Worm |
| RBPM | Portable Bitmap |
| RBS | ReBirth Song (Propellerhead Software) |
| RBS | RealiMation 3D Object |
| RBS | Rollback Script (Microsoft) |
| RBS | Rutherford Backscattering Spectroscopy Analysis Package |
| RBX | RapidBuilder Multimedia Simulation Format (XStream Software) |
| RBX | Ruby on Rails Script (Ruby on Rails Project) |
| RBZ | Rail Baron Player Saved Game |
| RC | C++ Resource Compiler Script File (Borland Software Corporation) |
| RC | Emacs Configuration |
| RC | Resource Script |
| RC | Visual C++ Resource Script (Microsoft) |
| RC | Mozilla (Netscape) Subscription Information (Mozilla.org) |
| RC | PowerBASIC Resource Script (PowerBASIC, Inc.) |
| RC2 | Developer Studio Non-editable Resources (Microsoft) |
| RC2 | ReCycle v.2 Audio Loop |
| RC3 | Vc98 Resources File |
| RCD | Formula 1 Car Race 2001 Season01 Drivers File |
| RCD | pcAnywhere Recorded Session File (Symantec Corporation) |
| RCD | Arcade Input File (Kirk Martini, University of Virginia) |
| RCE | NTgraph GUI Control 3D File |
| RCF | Colin Mc Rae Car Race Configuration |
| RCF | Rhapsody Cache (RealNetworks) |
| RCG | Netscape Newsgroup File |
| RCH | SWAT Reach Output File |
| RCI | SPEFO Stellar Spectra Analysis File |
| RCL | Checklist Repetitive Checklist (Checklist répétitive) (Francis Gagné) |
| RCL | Easy CD Creator Layout File (Sonic Solutions) |
| RCM | Logos Library System 2.x Verse Map |
| RCM | Polarmap Calculator Configuration |
| RCM | Technics Keyboard Rhythm Custom File |
| RCP | Recomposer's MIDI Sequencer Music File |
| RCP | Rich Chart Builder Project (Blue Pacific Software) |
| RCS | Colin McRae Rally Save Game File |
| RCS | RAD Developer Color Scheme |
| RCT | Developer Studio Resource Template (Microsoft) |
| RCT | AOL Tool File (America Online, Inc.) |
| RCV | Resource Compiler; Resource Script |
| RCX | Lego Mindstorms Robotics Invention System |
| RCY | ReCycled Audio Loop |
| RC_ | Winhelp Compressed File |
| RD | Philips Raw Data |
| RD | Captivate Project File (Macromedia, Inc.) |
| RD1 | Retirement Document System Data File (DATAIR Employee Benefit Systems, Inc.) |
| RD1 | Descent1 Registered Level File |
| RD2 | Retirement Document System Custom Text File (DATAIR Employee Benefit Systems, Inc.) |
| RD2 | Race Driver Version 2 Saved Game File (Codemasters Software Company Limited) |
| RD3 | CorelDream 3D |
| RD3 | Ray Dream Designer Graphics |
| RD4 | Ray Dream Designer Graphics |
| RD5 | Ray Dream Designer Graphics |
| RDA | Oracle Storage Area File |
| RDB | Gear CD Suite File |
| RDB | Netscape Communicator Aim File |
| RDB | Oracle Database Root File |
| RDB | TrueVector Rules Database |
| RDB | Wavelet Image Recording |
| RDB | ZoneAlarm Mailsafe Rules Database (Zone Labs) |
| RDB | Value Navigator Database (Energy Navigator) |
| RDB | Darkbot Random Database File (Darkbot - The talking IRC bot) |
| RDC | IBM Voice Type Language Scripts Data File |
| RDD | ReliaSoft ALTA 6 & Weibull++ 6 |
| RDEF | Geoworks UI Resource File |
| RDF | Burli Newsroom System File |
| RDF | Chromeleon Report Definition |
| RDF | Geoworks UI Compiler Source Code |
| RDF | Oracle Report Binary Source |
| RDF | ProWORX Nxt Cross-reference Data (Schneider Electric) |
| RDF | Rate Description File |
| RDF | Workshare Synergy Collaboration Response File |
| RDF | Mozilla (Netscape) Settings File (Resource Description Framework) (Mozilla) |
| RDF | ICRA Site Label File (Internet Content Rating Association (ICRA)) |
| RDI | Device-Independent Bitmap |
| RDI | SPEFO Stellar Spectra Analysis File |
| RDJ | JCanyon: Grand Canyon for Java DEM File in JPEG Format |
| RDL | Descent Registered Level |
| RDL | Paradox |
| RDL | RadioDestiny Radio Stream |
| RDL | Symbian Recogniser Library |
| RDL | SQL Server Reporting Services Report Definition Language (Microsoft) |
| RDM | Ragdoll Masters Preference File (Ragdoll Soft) |
| RDO | Oracle Redo Log File |
| RDO | Xerox Document Assembler Metafile |
| RDP | Remote Desktop Connection (Microsoft Corporation) |
| RDS | ERMIS Radio Data System |
| RDS | Ray Dream Studio Native Data Format (Eovia Corporation) |
| RDT | RDT Tracking File |
| RDV | NTgraph Borland C 32 File |
| RDX | Reflex Data File (Borland Software Corporation) |
| RDZ | Mandrake Linux Install File |
| RDZ | RemoteDocs File |
| REA | Doc Free Geocom File |
| README | Documentation File |
| REALDOWNLOAD | RealDownload Paused Download (Real.com) |
| REC | ARCSERVE Archivation Protocol |
| REC | EpiInfo Data |
| REC | RapidComm Voice File |
| REC | Sprint Record File |
| REC | Windows Recorder Macro |
| REC | ProMash Recipe (Sausalito Brewing Co.) |
| REC | EpiData Data File (EpiData Association) |
| REC | Medlin Accounting Bank Reconciliation Data (Medlin Accounting) |
| RED | Calrion Modula-2 Path Data |
| RED | Rational Rose Module Diagram (IBM) |
| RED | View Redline (Autodesk, Inc.) |
| RED | XRK - eXtra Redcode Kit Disassembled RedCode Warrior (Marco Pontello) |
| RED | Red Faction Level File (THQ Inc.) |
| RED | Boris Red Project File (Boris FX) |
| REF | Cross Reference |
| REF | Reference |
| REF | Pro/ENGINEER Temporary File (PTC) |
| REF | ReferBib Document |
| REF | Ad-Aware Signature File (Lavasoft) |
| REF | Train Simulator Object Reference File (Microsoft Corporation) |
| REFER | ReferBib Document |
| REG | Registration Data |
| REG | Registration Information/Key for W95/98 |
| REG | Registry Data File (Microsoft) |
| REG | Mozilla (Netscape) XPCOM Registry (Mozilla.org) |
| REGET | ReGet Deluxe Downloader |
| REL | ACT! Alarm Data File (Best Software CRM Division) |
| REL | Knowledge Explorer Knowledge Representation Relation |
| REL | Nokia Phone Audio File (Nokia) |
| REL | Retrieve 4GL Dataset File (Sage Enterprice Solutions) |
| REL | Norton Internet Security 2001 Log File (Symantec) |
| REM | Annotation |
| REM | ACT! Database Maintenance File (Best Software CRM Division) |
| REM | Delphi Memory Swap File (Borland) |
| REN | Possibly a Renamed File |
| REN | Renai Tsumyu Resshon Tsukuru 2 (Love Lesson Maker 2) (Enterpbrain) |
| REP | Blizzard Game Replay File (Blizzard Entertainment) |
| REP | QWK Reader Reply |
| REP | Report File |
| REP | Text Document |
| REP | ACT! Report Template (Best Software CRM Division) |
| REP | Complete Works Report (Toplevel Computing) |
| REP | Organizer Report (IBM) |
| REP | Sphinx Responses (Le Sphinx Développement) |
| REQ | Request |
| RES | C and C++ Compiled Resource (Microsoft) |
| RES | C++ Compiled Resource (Borland Software Corporation) |
| RES | Championship Bass Archive |
| RES | Evil Islands Archive |
| RES | Half Life Game Map |
| RES | Infinity Game Engine Character Biography (BioWare Corp.) |
| RES | Resource File |
| RES | XBoard Resign Conferences File |
| RESID | NML Language Compilation Residual File (NevoSoft) |
| RESIDENT2 | Resident Evil 2 Saved Game (Capcom) |
| RESX | NET XML Resource Template (Microsoft) |
| RET | Basic Realizer Careal Caret Samples |
| REV | FrameMaker Document (Adobe) |
| REV | Geoworks Revision File |
| REV | WinRAR Recovery Volume File |
| REV | Workshare Synergy File |
| REVALVER | ReValver Preset |
| REX | 4th Dimension Database Windows Client Local File (4D, Inc.) |
| REX | ACT! (Best Software CRM Division) |
| REX | Oracle Report Definition |
| REX | PharLab Executable File |
| REX | ReCycled Audio Loop Export File |
| REX | REXX Program File |
| REXX | Rexx Language Source Code |
| REZ | Aliens and Predator 2 Game |
| REZ | Blood 2 Archive |
| REZ | No One Lives for Ever Archive |
| REZ | LithTech Game Resource File (Touchdown Entertainment, Inc.) |
| REZ | Resume Divider (Luna) |
| REZ | Sanity: Aiken's Artifact Archive |
| REZ | Shogo Archive |
| REZ | Alien vs Predator 2 |
| REZ | Purge |
| REZ | Escape Velocity Nova Plug-in (Ambrosia Software, Inc.) |
| RF | FrameMaker Document (Adobe) |
| RF | RealFlash Clip |
| RF | Sun Raster Graphic |
| RF? | SmartWare Compiled Project File |
| RFA | Battlefield 1942 Unit/Object Texture Archive (Electronic Arts, Inc.) |
| RFA | Battlefield 1942 (DEMO) |
| RFB | RoboForm |
| RFD | Emperor: Battle for Dune Archive |
| RFD | Recogniform Desktop Reader Form Definition (Recogniform Technologies SpA) |
| RFF | Maggi Graphic File |
| RFG | RFG Integrator System Database |
| RFH | Maxagrid CTM Refresh File |
| RFH | RFG Integrator Householding Database |
| RFI | SPEFO Stellar Spectra Analysis File |
| RFL | ANSYS |
| RFL | Guardian Database Roll-forward File |
| RFL | Reason Sound Bank (Propellerhead Software) |
| RFL | RISAFloor Analysis & Design |
| RFM | Rich Music Format |
| RFP | AI RoboForm Passcard Database |
| RFR | Photoshop Frame Filter File (Adobe Systems Inc.) |
| RFT | AI RoboForm Form Database |
| RFT | IBM DisplayWrite Revisable Format Text |
| RFT | Revit Template (Autodesk, Inc.) |
| RFX | Modula M2SDS File |
| RFX | TouchStar License File |
| RG | Bitmap Graphic |
| RG | Rosegarden Music File |
| RGB | Q0 Graphic |
| RGB | Ribbons SGI Image |
| RGB | Silicon Graphics RGB Bitmap (Silicon Graphics, Inc.) |
| RGB | VideoCraft GIF |
| RGB | Intermediate Format Graphic |
| RGBA | Silicon Graphics RGB |
| RGD | Rosegarden MIDI Device Definition File |
| RGE | Inno Setup Registry Entries File |
| RGE | R.A.G.E. Driver |
| RGF | Advanced Registry Tracer Scan Data (ElcomSoft Co.Ltd.) |
| RGH | ZZ Rough Image |
| RGI | RealArcade Game Installer |
| RGL | Scarlett Expert System Compiler Rules File |
| RGN | Championship Manager Game File |
| RGN | Garmin Region File (Garmin Ltd.) |
| RGO | RepliGo Virtual Print File (Cerience Corporation) |
| RGP | RealArcade Game Package |
| RGP | Rosegarden Project |
| RGS | RealArcade Secured Game Installer (RealNetworks Inc.) |
| RGS | InstallShield Script for Windows Registry (InstallShield Software Corporation) |
| RGU | Data Recovery Software (Ontrack) |
| RGX | ReaGeniX Code Generator Symbol Table |
| RH | C++ Resource Header File (Borland Software Corporation) |
| RH | Deep Exploration Repository File (Right Hemisphere) |
| RHC | ClipX RLIB RHELP Source File |
| RHP | Rhino 3D Plug-in File (Robert McNeel & Associates) |
| RHTML | Ruby on Rails Script (Ruby on Rails Project) |
| RI | 1-2-3 (IBM) |
| RIA | Alpharel Group IV Raster Graphics |
| RIB | 3D Reality Renderman Format Graphics |
| RIC | Ricoh FAX Graphic File |
| RICHMEDIA | Norton Guides File |
| RICOCHETLW | Ricochet Lost Worlds Round (Reflexive Entertainment) |
| RIF | Fractal Painter Bitmap |
| RIF | Raster Image File Format |
| RIF | Recource Interchange File Format Bitmap Image |
| RIF | Rockwell ADPCM Audio |
| RIF | FutuRUG Encrypted Resident Information File (Two Brothers Software) |
| RIFF | Raster Image File Format |
| RIFF | Recource Interchange File Format Bitmap Image |
| RIFL | Business Integrator Real-Time Integration Flow Language Script (Pervasive Software Inc.) |
| RIG | LightWave 3D RIG Function File (NewTek) |
| RIN | RappInfo PostScript Converter Configuration File |
| RIN | Retrieve 4GL Database Index (Sage Enterprice Solutions) |
| RIP | Notes Error File (IBM) |
| RIP | Quincy Program Crash Report |
| RIP | Remote Imaging Protocol |
| RIP | Telegrafx Remote Imaging Protocol |
| RIR | Spaceward Satori Family Native |
| RIS | Bibliographic Reference File |
| RIS | HDF Zlib File |
| RISCOS | Riscos Make File |
| RIT | Velrita Document File |
| RIV | CRiSP Harvest File |
| RIX | ColorRIX VGA Paint Bitmap (RIX SoftWorks Inc.) |
| RIX | RIX Virtual Screen |
| RJS | RealJukebox Skin (RealNetworks, Inc.) |
| RK | RK Archiver / RKAU Audio (M Software) |
| RKA | RK Archiver / RKAU Audio (M Software) |
| RKT | RockSim Rocket Design File (Apogee Rockets) |
| RKV | RKIVE Compressed Archive |
| RKW | RockWorks Graphic (RockWare, Inc.) |
| RL | The 7th Guest Archive |
| RL$ | Basic Realizer Disk1 File |
| RL1 | Descent1 Registered Level File |
| RL2 | Descent2 Registered Level |
| RL4 | Bitmap Graphic |
| RL8 | Bitmap Graphic |
| RLA | Advanced Visualizer File |
| RLA | Wavefront Raster Image |
| RLB | Harvard Graphics (Harvard Graphics) |
| RLB | Insight II Residue Library (Accelrys Software Inc.) |
| RLB | Wavefront Bitmap (Alias) |
| RLC | ArcView Image File (ESRI) |
| RLC | Image Systems CAD Overlay |
| RLC | Run Length RLC Bitmap |
| RLC | Scanner One-bit/pixel Grahpic Output |
| RLD | Norton Commander 5.0 Temporary File |
| RLE | Run Length Encoded Bitmap |
| RLE | Utah Raster Toolkit Bitmap Image |
| RLE | ADEX Corporation ChromaGraph Graphics Card Bitmap Graphic |
| RLF | ArtCAM Pro Relief File (Delcam plc) |
| RLG | Regcleaner Language File |
| RLG | ReliaSoft ALTA 6 & Weibull++ 6 |
| RLI | RVS-COM Least-cost-routing Tariff Database (Living Byte Software GmbH) |
| RLL | Basic Realizer Careal File |
| RLL | IP-EPS |
| RLL | SQL Server Resource Library (Microsoft) |
| RLO | Basic Realizer Careal Library File |
| RLS | RadLight Skin (RadLight) |
| RLT | ReliaSoft BlockSim & Weibull++ 6 |
| RLV | Basic Realizer Careal Clipart |
| RLW | ReliaSoft ALTA 6 & BlockSim & Weibull++ 6 |
| RLZ | Realizer Source Code |
| RM | RealMedia Streaming Media (Real Networks, Inc.) |
| RMC | RMCalc |
| RMD | RegMaid Document (Microsoft) |
| RME | SB_AWE Keys File |
| RME | Final Fantasy Sound (Square Enix Co., Ltd) |
| RMF | Acrobat Rights Management Document (Adobe) |
| RMF | Beatnik Rich Music Format (Beatnik) |
| RMF | Rich Map Format |
| RMG | ANSYS |
| RMG | Temporary File |
| RMG | RootsMagic Genealogy File (FormalSoft) |
| RMI | MIDI File |
| RMJ | RealJukebox Media (Real Networks, Inc.) |
| RMK | Clipper RMake Make File |
| RML | Redline Markup Language File |
| RMM | RealMedia Metafile (RealNetworks, Inc.) |
| RMO | Selectica RateBuilder |
| RMP | RIFF MP3 Audio File |
| RMP | RealJukebox Track Info Package (Real Networks, Inc.) |
| RMR | Resume Maker File |
| RMS | AutoCAD Data File for Boss RMS |
| RMS | RealMedia Secure Media File (Real Networks, Inc.) |
| RMS | Rise of Nations Random File (Microsoft) |
| RMS | Dynamite VSP Road Marking Style (3am Solutions (UK) Limited) |
| RMT | CONSEL Input File (Dept. of Mathematical and Computing Sciences Tokyo Institute of Technology) |
| RMVB | RealVideo Variable Bit Rate File (RealNetworks, Inc.) |
| RMW | Final Fantasy Sound (Square Enix Co., Ltd) |
| RMX | RealMedia Secure Media Clip (Real Networks, Inc.) |
| RN | Nota Bene XPL Program |
| RND | AutoCAD Autoshade Rendering Slide (Autodesk, Inc.) |
| RND | Pretty Good Privacy (PGP) Random Seed (PGP Corporation) |
| RNG | Nokia Phone Ringtone File (Nokia) |
| RNG | Top Secret Crypto Gold RSA Key Ring File (TAN$TAAFL Software Company) |
| RNG | RELAX NG (OASIS RELAX NG TC) |
| RNK | Dial-up Shortcut |
| RNL | GTX Runlength Raster Graphics |
| RNO | VAX Runoff File |
| RNS | Renoise Professional Music Tracker |
| RNS | Reason Audio File (Propellerhead Software) |
| RNT | EdgeCAM Licensing Data Ffile (Pathtrace Engineering Systems) |
| RNX | RealPlayer File (RealNetworks) |
| ROADS | ROADS++ Documnet |
| ROB | Microsoft Art Gallery File |
| ROB | Real Player (RealNetworks, Inc.) |
| ROC | SpaceCAD Rocket Design (SpaceCAD.com) |
| ROD | e.Report Designer Report Object Design (Actuate Corporation) |
| ROF | ReliaSoft RG |
| ROFF | Roff/nroff/troff/groff Unformatted Manual Page (UNIX) |
| ROI | ReportBlast (Actuate) |
| ROI | Shark Sales System Data File (Shark Finesse Ltd) |
| ROI | e.Report Designer Report Object Instance (Actuate Corporation) |
| ROL | AdLib Visual Composer Music File |
| ROL | e.Report Designer Report Object Library (Actuate Corporation) |
| ROM | MZ700 Emulator |
| ROM | Nintento 64 Emulation ROM Image |
| ROM | Read Only Memory Image |
| ROM | MSX/MSX2 ROM Image |
| ROOT | ROOT Data File (Rene Brun & Fons Rademakers) |
| ROQ | Medal of Honor - Allied Assualt |
| ROQ | Id Software RoQ Movie (id Software) |
| ROT | Rotater 3D Image |
| ROT | Home World 2 ROT Graphics (Sierra Entertainment, Inc.) |
| ROU | English Lake District Walker Calculator Route File |
| ROU | MapSource Route Information (Garmin Ltd.) |
| ROV | Rescue Rover Data |
| ROV | e.Report Designer Report Object Value (Actuate Corporation) |
| ROW | RowPro Rowfile (Digital Rowing Inc.) |
| ROX | ReportBlast (Actuate) |
| ROX | e.Report Designer Report Object Executable (Actuate Corporation) |
| ROY | TrueType |
| RP | Rainbow Painter |
| RP | RealPix Clip (Real Networks, Inc.) |
| RP0 | RescuePro Physician Invoice File |
| RP1 | Database Text; R&R Report File |
| RP1 | RescuePro Physician Invoice File |
| RP2 | RescuePro Physician Invoice File |
| RP3 | Need for Speed Car Race File |
| RP3 | RescuePro Physician Invoice File |
| RP4 | RescuePro Physician Invoice File |
| RP5 | RescuePro Physician Invoice File |
| RP6 | RescuePro Physician Invoice File |
| RP7 | RescuePro Physician Invoice File |
| RP8 | RescuePro Physician Invoice File |
| RP9 | RescuePro Physician Invoice File |
| RPA | Rebel Strip Poker Supplementary Video/audio File (Rebel Software) |
| RPB | Automotive Diagnostic |
| RPB | CP Backup Report |
| RPB | Radmin (Remote Administrator) Phonebook (Famatech, LLC.) |
| RPB | RowPro Database Backup (Digital Rowing Inc.) |
| RPBM | Portable Image |
| RPC | Rich Photorealistic Content (ArchVision, Inc.) |
| RPC | 3WayPack (The Three-Mode Company) |
| RPC | Crystal Reports (Microsoft Corporation) |
| RPCP | Reason Resource Package (Propellerhead Software) |
| RPD | Rapidfile Database |
| RPD | RosaPro File |
| RPD | RPV Printing System File |
| RPF | AutoCAD Raster-pattern Fill Definition (Autodesk, Inc.) |
| RPF | ProWORX Nxt Cross-reference Pointer (Schneider Electric) |
| RPF | Raven Check Convertor Payment File (DeepCove Labs) |
| RPG | RPG Programming Language |
| RPG | O.H.R.RPG.C.E Role-Playing Game (Hamster Republic Publications) |
| RPGM | Portable Greyscale |
| RPIN | InDesign Import/Export Filter (Adobe Systems Inc.) |
| RPJ | Relex |
| RPK | RadLight Skin |
| RPK | Rippack File |
| RPK | NeverForget Backup Reminder File (National Creative Registry, Inc.) |
| RPL | Replica Text File |
| RPL | Reply Message |
| RPL | Escape Replay (Compressed Video) File (Eidos) |
| RPL | Crystal Reports for Visual dBASE Label File |
| RPM | INUX Package |
| RPM | RealMedia Player Plug-in (RealNetworks) |
| RPM | RedHat Package Manager |
| RPM | RunPaint Multicolor Graphic |
| RPNM | Portable Image |
| RPPM | Portable Image |
| RPR | IBM Voice Type Language Vocabels File |
| RPR | AppSight Console Recording Profile (Identify Software Ltd.) |
| RPR | RapidBuilder Simulation (XStream Software) |
| RPS | Borland Translation Repository (Borland Software Corporation) |
| RPS | Reason Song (Propellerhead Software) |
| RPT | Crystal Reports Output File (Report) (Crystal Decisions) |
| RPT | MicroSim PCBoard Reports Reflecting Autorouting Progress and Statistics |
| RPT | Report |
| RPT | Sierra Mastercook Cookbook File |
| RPT | Visual Basic Crystal Reports File (Microsoft) |
| RPT | TeamQuest View Report Syntax (TeamQuest Corporation) |
| RPV | Listlabl File |
| RPV | Real Player Visualization File |
| RPV | Rebel Strip Poker Main Oopponent Video File (Rebel Software) |
| RPV | RPV Printing System File |
| RPW | RPWiz Project |
| RPX | Electronic Storage Corporation Laser Vault Index |
| RPX | Oracle Visual Information Retrieval Raw Pixel Format File |
| RPX | Repute Tutorial File |
| RPY | Grand Prix Legends Racing Simulation Game File |
| RPY | Star Wars - Tie Fighter Media |
| RPZ | Crystal Reports Encrypted and Zipped Report File (Crystal Decisions) |
| RQS | Rational RequisitePro Project (IBM) |
| RQY | Excel OLE DB Query File (Microsoft) |
| RR | Railroad Tycoon (PopTop Software Inc.) |
| RRB | RoboRally Board Editor Board File (Norbert Langernamm) |
| RRD | ERDAS IMAGINE (Leica Geosystems , LLC) |
| RRD | RapidReader Document (SoftOlogy IdeaWorks, LLC) |
| RRF | Musicmatch Jukebox File |
| RRF | Raytech Navigator (Raymarine) |
| RRF | Registry Engineer Registry Backup (ArcaneWooD software) |
| RRGT | REALrunner Lite Graphics Theme (Gryphonclaw Software) |
| RRI | SPEFO Stellar Spectra Analysis File |
| RRR | Rhapzodé Resource Repository (Alta Vente) |
| RRS | Road Rash Save File |
| RRSE | REALrunner Lite Sound Effect (Gryphonclaw Software) |
| RRT | Rhapzodé Resource Template (Alta Vente) |
| RS | Amiga Reassembler Resource Data (Amiga) |
| RS | EROSION 3D Event File |
| RS | Sun Raster Graphic |
| RS | dnaLIMS Reaction Sheet (dnaTools) |
| RS | RapidSketch Sketch Document (Utilant, LLC) |
| RS6000 | RS 6000 Make File |
| RSA | PKCS7 Signature, MD5 + RSA |
| RSAKEY | Top Secret Crypto Gold RSA Key File (TAN$TAAFL Software Company) |
| RSB | Red Storm Image Format |
| RSB | ReliaSoft BlockSim |
| RSB | Rainbow Six: Rogue Spear Bitmap (Red Storm Entertainment, Inc.) |
| RSC | Compiled Resource |
| RSC | NASCAR Racing 2002 Paint Shop Controller File (Sierra) |
| RSC | Resource File |
| RSC | SymbianOS Application Resource File |
| RSC | Carnivores / Ice Age Map Areas (Action Forms, Ltd.) |
| RSC | Pegasus Mail Resource File (David Harris) |
| RSD | Roland Visual MT File |
| RSD | Scanner Recognita file |
| RSD | Resort Software Database (Resort Software Pty. Ltd.) |
| RSF | Mediafour MacDrive Macintosh Resource Fork |
| RSF | ReliaSoft BlockSim |
| RSF | Reflection Setting File (WRQ) |
| RSG | EPOC Compiled Resource Header |
| RSG | Drakan: Order Of The Flame Saved Game (Surreal Software, Inc.) |
| RSH | 3DReshaper Project (TECHNODIGIT - a Department of The MBPS-AIRINDEX Group) |
| RSH | Warhammer 40,000 Texture (Games Workshop Ltd) |
| RSK | RiskMan Risk Project |
| RSL | Paradox Version 7 Report (Borland Software Corporation) |
| RSL | PageMaker (Adobe) |
| RSL | Paradox |
| RSL | PC Tools Resources Library |
| RSL | ReliaSoft ALTA 6 |
| RSL | Robot Scripting Language |
| RSM | ReliaSoft MPC 3 |
| RSM | Resume |
| RSM | RuneSword II Game |
| RSM | WinWay Deluxe Resume File |
| RSML | Real Player File |
| RSP | Linker Response File |
| RSP | MDaemon File |
| RSP | ODBC Driver Configuration File (Microsoft) |
| RSP | ReliaSoft BlockSim |
| RSP | Responce Text File |
| RSP | Rockwell Software Logix 5 File |
| RSP | Workshare Synergy Response File |
| RSP | Universal Installer Response File (Oracle) |
| RSP | Rational Project Project (IBM) |
| RSP | ReadSay Phrase Library (ReadSay Literacy Consulting) |
| RSR | 4th Dimension Database Resource Fork (4D, Inc.) |
| RSRC | Mac OS Resource File |
| RSS | EPOC Resource Source File |
| RSS | ReliaSoft BlockSim |
| RSS | Rockwell Logix 500 SLC-5 Software |
| RSS | Rich Site Summary File |
| RSS | PlanMan Image (Invarion Pty Ltd) |
| RST | ANSYS Results |
| RST | IBM Voice Type Language Scripts Data File |
| RST | ReliaSoft BlockSim |
| RST | LochMaster Strip Board (ABACOM Ingenieurbüro) |
| RSTRNT | Insight II Distance, Torsion, Chiral, and NOE Volume Restraints (Accelrys Software Inc.) |
| RSW | ReliaSoft BlockSim |
| RS_ | ArcView Image File (ESRI) |
| RS_ | Macintosh File Resource Fork |
| RT | RealText (Real Networks, Inc.) |
| RT | Rich Text |
| RT$ | NTgraph Visual C Wizzard File |
| RTA | IBM Voice Type Language Vocabels File |
| RTA | RoboHelp Configuration |
| RTB | Rhino 3D Toolbar Collection File (post-Sept 2003) (Robert McNeel & Associates) |
| RTC | Rescue Me File |
| RTD | Ragtime Examples Render File |
| RTD | Retina Network Security Scanner Output File (eEye Digital Security) |
| RTD | ROBOT Structure File (RoboBAT) |
| RTE | MicroSim PCBoard Routes Established By a Successfully Completed Autorouting Run |
| RTE | Fugawi Global Navigator Route (Northport Systems Inc.) |
| RTF | Rich Text Format File |
| RTFD | NeXT RTF-Packet Rich Text File with Attachments (Apple) |
| RTFENX | egis Encrypted RTF File (HiTRUST Inc.) |
| RTH | ANSYS Results |
| RTK | RoboHelp Configuration |
| RTL | Borland Runtime Library (Borland Software Corporation) |
| RTL | HP Color Printer Raster Transfer Language (Hewlett-Packard Development Company, L.P.) |
| RTL | Norton Utilities 7.0 Runtime Library |
| RTL | Text File |
| RTM | ReliaSoft RG |
| RTM | Real Tracker Module/Song |
| RTMDL | Rational Rose RealTime Model (IBM) |
| RTP | Gerber Sign-making Software File |
| RTP | Patch File (Microsoft) |
| RTP | RTPatch Update Package |
| RTP | TurboTax Update File (Intuit) |
| RTPL | Nokia Phone Ring Tone (Nokia) |
| RTR | IBM Voice Type Language Vocabels File |
| RTS | QuickTime Real-Time Streaming Protocol File (Apple Computer, Inc.) |
| RTS | RealAudio RTSL Document |
| RTS | Realizer Runtime Library |
| RTS | RIT Multilingual Transliteration Scheme |
| RTS | RoboHelp Configuration |
| RTS | Resource Tuner Console Script (Heaventools Software) |
| RTSP | QuickTime Real-Time Streaming Protocol File (Apple Computer, Inc.) |
| RTT | Ragtime File |
| RTTTL | Ring Tones Text Transfer Language File |
| RTV | NewTek Products Uncompressed Video (NewTek) |
| RTWKS | Rational Rose RealTime Model (IBM) |
| RTX | Mobile Phone Ringtone |
| RTX | Reliacast Audience Manager Turnstile |
| RTX | Rich Text Document |
| RT_ | Winhelp Compressed File |
| RU | Javasoft JRE 1.3 Library File |
| RUF | ProWORX Nxt Address Used Tables Reference (Schneider Electric) |
| RUI | SPEFO Stellar Spectra Analysis File |
| RUJ | Oracle Recovery-Unit Journal |
| RUL | Echo-conference Rules |
| RUL | Expert System Rule |
| RUL | InstallShield Rules File (InstallShield Software Corporation) |
| RUL | SpamAI Spam Rule Repository (DAIR Computer Systems) |
| RUL | TurboTax Rule File (Intuit) |
| RUN | PC Tools Script Tools Program |
| RUN | AMOS Executable File (Alpha Micro) |
| RUN | ISAPI Loader Current ISAPI Application (EGGcentric) |
| RUN | Softworks Basic Compiled Pseudo Code (Softworks Limited) |
| RUS | Russian Text |
| RV | RealVideo Clip (Real Networks, Inc.) |
| RV | SPEFO Stellar Spectra Analysis File |
| RV4 | 1040 Review Taxpayer Data File (HC Sharp Software, Inc.) |
| RVB | Rhino 3D Visucal Basic Script File (Robert McNeel & Associates) |
| RVC | TNTmips Windows Version Project File (MicroImages, Inc.) |
| RVD | VPHybridCAD softelec Format File (softelec GmbH) |
| RVF | TNTmips DOS Version Project File (MicroImages, Inc.) |
| RVG | Revit External Group File |
| RVI | Revenant Archive |
| RVM | Revenant Archive |
| RVML | Rich Vector Markup Language (Kinesis Software Ltd.) |
| RVN | Riven Saved Game |
| RVP | C|Net CatchUp File |
| RVP | Scan Configuration File (Microsoft) |
| RVR | SPEFO Stellar Spectra Analysis File |
| RVS | Revenant Archive |
| RVS | RasterVect Combined Raster and Vector Graphic File (RasterVect Software) |
| RVT | Apache Rivet Tcl File |
| RVT | IEX Workforce Management Report |
| RVT | Incite Media Assistant File |
| RVT | Revit Design Setup File |
| RVT | VersaPro Reference View Table |
| RVW | Review |
| RVX | Reflection Web Launch (WRQ) |
| RVX | RealVideo Streaming File (Protected) (Real Networks, Inc.) |
| RW | Boso View Express Railway Definition File (Mackoy) |
| RW5 | Tripod Data Systmes Survey Pro Data File |
| RW6 | ReliaSoft Weibull++ 6 |
| RWA | ReliaSoft Weibull++ 6 |
| RWD | Symphonie Raw Wind Data |
| RWF | ReFrame Workspace (HingePoint, Inc.) |
| RWG | Random Word Generator |
| RWMT | ReliaSoft Weibull++ 6 MT |
| RWP | IBM Configurator Report |
| RWP | MENSI Realworks Survey |
| RWS | C++ Resource Workshop Symbol File (Borland Software Corporation) |
| RWS | MENSI Realworks Survey |
| RWS | REDIPlus Workspace (REDIProducts) |
| RWX | MEME Shape File |
| RWX | Netscape Live 3D |
| RWX | RenderWare Script |
| RWZ | Outlook Rules Wizard File (Microsoft) |
| RX | E3 Security Kit Prescription File (radsoft.net) |
| RX | DOS 7 File |
| RX | EARS Component File |
| RX | Reflex Database Driver (Borland Software Corporation) |
| RX2 | ReCycle! Format Audio Loop (Propellerhead Software) |
| RXC | Reflection X Client File (WRQ) |
| RXC | Easy CD Creator Drag to Disk File (Sonic Solutions) |
| RXD | Reflex Database (Borland Software Corporation) |
| RXF | Recipe Exchange Format (Resort Software Pty. Ltd.) |
| RXF | Resco Encrypted File (Resco, sro) |
| RXH | Reflex Database Help File (Borland Software Corporation) |
| RXML | Roxen WebServer RoXen Macro Language (Roxen Internet Software AB) |
| RXN | MDL Rxn File |
| RXP | Easy CD & DVD Creator 6 Playlist (Sonic Solutions) |
| RXR | Reflex Database Report (Borland Software Corporation) |
| RXS | Reflex Database Screen Driver (Borland Software Corporation) |
| RXS | AudioCentral Roxio Markup Sound (Sonic Solutions) |
| RXS | Easy CD & DVD Creator 6 Markup Sound (Sonic Solutions) |
| RZR | in-sync Speed Razor Project File |
| RZX | in-sync Speed Razor Project File |
| RZX | RamSoft's ZX Spectrum Replay |