| File extension Name |
extension description |
| .R | Paradox File |
| .R | REBOL Script or Data File (REBOL Technologies) |
| .R | Macintosh Resource Similar to RC |
| .R | Pegasus Mail Resource File (David Harris) |
| .R | Progress Database Compiled Program File (Progress Software Corporation) |
| .r | Ratfor FORTRAN Preprocessor File |
| .R | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .R | Xcode Core Rez Program (Apple Inc.) |
| .R00 | WinRAR Split Compressed Archive (RarLab) |
| .R01 | MicroStation Modification Resource (Bentley Systems, Incorporated) |
| .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 | TaxCalc Tax File (Acorah Software Products Ltd.) |
| .R08 | WinRAR Split Compressed Archive (RarLab) |
| .R09 | WinRAR Split Compressed Archive (RarLab) |
| .R1A | Yamaha RM1x Dance-Music Workstation (Yamaha Corporation of America) |
| .R1M | RealOne Metadata Package (RealNetworks) |
| .R1W | Reflection Setting File (WRQ) |
| .R2A | RS7000 All Data (Yahama Corporation) |
| .R2A | Yamaha RS7000 Music Production Studio Sequencer (Yamaha Corporation of America) |
| .R2D | Reflex Ver. 2 Data File (Borland Software Corporation) |
| .R2D | RISA-2D Simple Analysis & Design |
| .R2K | Repertoire 2000 Music Database |
| .R2P | RS7000 Pattern Data (Yahama Corporation) |
| .R2P | Yamaha RS7000 Music Production Studio Sequencer (Yamaha Corporation of America) |
| .R2S | RS7000 Song Data (Yahama Corporation) |
| .R2W | Reflection Setting File (WRQ) |
| .R36 | Recomposer MIDI Sequencer Music File |
| .R3A | RS7000 Sample Data (Yahama Corporation) |
| .R3A | Yamaha RS7000 Music Production Studio Sequencer (Yamaha Corporation of America) |
| .R3D | Redcode Raw Video Image File (RED Digital Cinema Camera Company) |
| .R3D | Raider3D Image File (OKYZ SA) |
| .R3D | RISA-3D 3D Analysis & Design |
| .R3D | Realsoft 3D Image (Realsoft Graphics Oy) |
| .R3P | Yamaha RS7000 Music Production Studio Sequencer (Yamaha Corporation of America) |
| .R3P | RS7000 Sample Data (Yahama Corporation) |
| .R4W | Reflection Setting File (WRQ) |
| .R5 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .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 Corporation) |
| .R82 | Flight Simulator Texture File (Microsoft Corporation) |
| .R8L | LaserJet Landscape Font |
| .R8P | Intellifont PCL 4 Bitmap Font File |
| .R8P | LaserJet Portrait Font |
| .RA | Remote Access Data File |
| .RA | RealMedia Streaming Media (Real Networks, Inc.) |
| .RA3 | RA3DIO Terrain Information (xeraina GmbH) |
| .RA6 | ReliaSoft ALTA 6 |
| .RABBIT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAC | Win2020 Screen Subtitle (Screen Subtitling Systems) |
| .RAC | Venue Race Application Race Description File (Concept2 Inc.) |
| .RAC | Conversation with Racter |
| .RAD | Radiance Scene Description Format |
| .RAD | Rhapsody Cache (RealNetworks) |
| .RAD | Reality AdLib Tracker 2-op FM Music |
| .RADIOREVOLUTION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAF | Illum Source RK File |
| .RAF | Fuji CCD-RAW Graphic File (Fuji Photo Film U.S.A., Inc.) |
| .RAG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAI | SPEFO Stellar Spectra Analysis File |
| .RAIDERS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAIL | DeckTools Custom Railing Design (DeckTools) |
| .RAINDROPPIC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAINY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAL | Right Track Layout File (Atlas Model Railroad Co., Inc.) |
| .RAM | RealMedia Metafile (RealNetworks, Inc.) |
| .RAMBLOCKS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAMCARD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAMDISK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAMSON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAN | Dexterpen File |
| .RAP | Scientific Workplace Wrap File (MacKichan Software, Inc.) |
| .RAP | Redox DAS Plug-in (REDOX d.o.o.) |
| .RAP | RadASM Project File (KetilO) |
| .RAP | Rapidocs Document |
| .RAP | RapAnalyst Knowledge Filter file (Raptor International) |
| .RAP | Magix Musstu Rap File |
| .RAP | RunAs Professional Configuration (MAST Hard- & Software / MAST Webdesign) |
| .RAPP | Adesso Replication Application (Adesso Systems, 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 | Supposed Compressed Torrent File |
| .RAS | Max Payne Data File (Rockstar Games) |
| .RAS | Sky Subtracted Data |
| .RAS | Sun Raster Graphic (Sun) |
| .RAS | Cals Raster File |
| .RASMOL | RasMol File |
| .RASMOLRC | RasMol Configuration File |
| .RAST | Sun Raster Graphic |
| .RAST | Spore Texture/Model File (Electronic Arts, Inc.) |
| .RASTER | Spore Texture/Model File (Electronic Arts, Inc.) |
| .RAT | Nimbus 7 SAMS Data File |
| .RAT | RandyTab Tablature (Randy Inc.) |
| .RAT | Recreational Software Advisory Council |
| .RAT | RATS Data |
| .RAT | Rating System File |
| .RATDVD | ratDVD DVD Container (RatDVD - Canada) |
| .RATES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAV | Rave Reports Project File (Nevrona Designs) |
| .RAV | Rising Antivirus Quickscan File (Rising Antivirus International Pty Ltd) |
| .RAV | Fifa 2001 Environment Data |
| .RAW | RDosPlay RAW Audio Format |
| .RAW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RAW | Nicolet Summit/DaStar Data File (Nicolet Instrument Technologies, Inc.) |
| .RAW | Raw Data for CD-ROM Writing (Nero AG) |
| .RAW | Nimbus 7 SAMS Data File |
| .RAW | V41/eV41 Program Files |
| .RAW | Image Alchemy HSI Temporary Raw Bitmap |
| .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 | VitaGraph File |
| .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 | Ruby Script (Ruby Community) |
| .RB | REALbasic Project (REAL Software, Inc.) |
| .RB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RB0 | Anti-Virus Backup |
| .RB1 | Anti-Virus Backup |
| .RB1 | R:Base Data (R:BASE Technologies, Inc.) |
| .RB2 | R:Base Data (R:BASE Technologies, Inc.) |
| .RB2 | Anti-Virus Backup |
| .RB3 | Anti-Virus Backup |
| .RB3 | R:Base Data (R:BASE Technologies, Inc.) |
| .RB4 | R:Base Data (R:BASE Technologies, Inc.) |
| .RB4 | Anti-Virus Backup |
| .RB4 | Resume Builder Ver 4 Data File (Sarm Software) |
| .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) |
| .RBBAS | REALbasic Class (REAL Software, Inc.) |
| .RBC | Easy Resume Creator Pro Resume (Sarm Software) |
| .RBF | Rollback File (Microsoft Corporation) |
| .RBF | R:Base Data (R:BASE Technologies, Inc.) |
| .RBF | Oracle Backup File |
| .RBF | Quartus II Raw Binary File (Altera Corporation) |
| .RBFRM | REALbasic Window (REAL Software, Inc.) |
| .RBG | RegexBuddy GREP Action (JGsoft - Just Great Software) |
| .RBH | RoboHelp Configuration |
| .RBI | eBahn Reader (Bentley Publishers) |
| .RBI | Adressmn |
| .RBJ | XRK - eXtra Redcode Kit RedCode Warrior (Marco Pontello) |
| .RBK | Windows 95 Registry Backup File (Microsoft Corporation) |
| .RBL | RegexBuddy Library (JGsoft - Just Great Software) |
| .RBM | ReBirth Modulation v2.0 (Propellerhead Software) |
| .RBM | Rail Baron Player Map |
| .RBMNU | REALbasic Menu (REAL Software, Inc.) |
| .RBN | Real Sound File |
| .RBN | Richard's Bridge Notation |
| .RBO | Sometimes associated with the Magistr.B Worm |
| .RBO | REALbasic Class (REAL Software, Inc.) |
| .RBP | REALbasic Project (REAL Software, Inc.) |
| .RBPM | Portable Bitmap |
| .RBR | Wordnet Backup File (NICE Systems Ltd.) |
| .RBRES | REALbasic Resource (REAL Software, Inc.) |
| .RBS | RealiMation 3D Object |
| .RBS | Rollback Script (Microsoft Corporation) |
| .RBS | Rutherford Backscattering Spectroscopy Analysis Package |
| .RBS | ReBirth Song (Propellerhead Software) |
| .RBT | LEGO NXT Brick (The LEGO Group) |
| .RBT | REALbasic Project (REAL Software, Inc.) |
| .RBVCP | REALbasic Project (REAL Software, Inc.) |
| .RBW | REALbasic Window (REAL Software, Inc.) |
| .RBX | Ruby on Rails Script (Ruby on Rails Project) |
| .RBX | RapidBuilder Multimedia Simulation Format (XStream Software) |
| .RBX | REALbasic Plug-in (REAL Software, Inc.) |
| .RBXL | ROBLOX Game File (ROBLOX Corporation) |
| .RBXM | ROBLOX Model (ROBLOX Corporation) |
| .RBZ | Rail Baron Player Saved Game |
| .RC | PowerBASIC Resource Script (PowerBASIC, Inc.) |
| .RC | Mozilla (Netscape) Subscription Information (Mozilla.org) |
| .RC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RC | Compiler Resource File |
| .RC | C++ Resource Compiler Script File (Borland Software Corporation) |
| .rc | UNIX Configuration or Initialization File |
| .RC | Visual C++ Resource Script (Microsoft Corporation) |
| .RC2 | ReCycle v.2 Audio Loop |
| .RC2 | Developer Studio Non-editable Resources (Microsoft Corporation) |
| .RC3 | Vc98 Resources File |
| .RCD | Formula 1 Car Race 2001 Season01 Drivers File |
| .RCD | Arcade Input File (Kirk Martini, University of Virginia) |
| .RCD | pcAnywhere Recorded Session File (Symantec Corporation) |
| .RCE | NTgraph GUI Control 3D File |
| .RCF | Rhapsody Cache (RealNetworks) |
| .RCF | Colin Mc Rae Car Race Configuration |
| .RCG | Netscape Newsgroup File |
| .RCG | Reliable Change Generator Data File (Psytek Ltd.) |
| .RCH | SWAT Reach Output File |
| .RCI | SPEFO Stellar Spectra Analysis File |
| .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 |
| .RCO | Playstation Sub-Menu Graphics and Localized Resources (Sony Corporation of America) |
| .RCP | Recomposer MIDI Sequencer Music File |
| .RCP | Rich Chart Builder Project (Blue Pacific Software) |
| .RCPROJECT | iMovie Project File (Apple Inc.) |
| .RCS | SaralTDS eTDS Software Annual Report (Relyon Softech Ltd.) |
| .RCS | RAD Developer Color Scheme |
| .RCS | RCSWin Job File (RCS Corporation) |
| .RCS | Colin McRae Rally Save Game File |
| .RCT | AOL Tool File (America Online, Inc.) |
| .RCT | Developer Studio Resource Template (Microsoft Corporation) |
| .RCV | Resource Compiler; Resource Script |
| .RCX | Lego Mindstorms Robotics Invention System (The LEGO Group) |
| .RCY | ReCycled Audio Loop |
| .RC_ | Winhelp Compressed File |
| .RD | MDL Molfile Reaction File (MDL Information Systems, Inc.) |
| .RD | Philips Raw Data |
| .RD | Captivate Project File (Macromedia, Inc.) |
| .RD1 | Descent1 Registered Level File |
| .RD1 | Retirement Document System Data File (DATAIR Employee Benefit Systems, Inc.) |
| .RD2 | Race Driver Version 2 Saved Game File (Codemasters Software Company Limited) |
| .RD2 | Retirement Document System Custom Text File (DATAIR Employee Benefit Systems, Inc.) |
| .RD3 | CorelDream 3D |
| .RD3 | Ray Dream Designer Graphics |
| .RD4 | Ray Dream Designer Graphics |
| .RD5 | Ray Dream Designer Graphics |
| .RDA | Oracle Storage Area File |
| .RDA | Ready Ace Accounting Database (Codice srl) |
| .RDATA | R Saved Workspace (WU Wien) |
| .RDB | Wavelet Image Recording |
| .RDB | Redis Database File |
| .RDB | TrueVector Rules Database |
| .RDB | Oracle Database Root File |
| .RDB | Darkbot Random Database File (Darkbot - The talking IRC bot) |
| .RDB | Gear CD Suite File |
| .RDB | ZoneAlarm Mailsafe Rules Database (Zone Labs) |
| .RDB | Netscape Communicator Aim File |
| .RDB | Value Navigator Database (Energy Navigator) |
| .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 | Resource Description Framework RSS Feed (Ver. 0.9 and 1.0) (World Wide Web Consortium) |
| .RDF | Workshare Synergy Collaboration Response File |
| .RDF | Chromeleon Report Definition |
| .RDF | Relux Professional (Relux Informatik AG) |
| .RDF | ProWORX Nxt Cross-reference Data (Schneider Electric) |
| .RDF | Oracle Report Binary Source |
| .RDF | Yaesu Radio Memory File (Vertex Standard Inc.) |
| .RDF | Mozilla (Netscape) Settings File (Resource Description Framework) (Mozilla) |
| .RDF | Geoworks UI Compiler Source Code |
| .RDF | ICRA Site Label File (Internet Content Rating Association (ICRA)) |
| .RDF | Rate Description File |
| .RDI | Device-Independent Bitmap |
| .RDI | SPEFO Stellar Spectra Analysis File |
| .RDIALOG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RDJ | JCanyon: Grand Canyon for Java DEM File in JPEG Format |
| .RDL | SQL Server Reporting Services Report Definition Language (Microsoft Corporation) |
| .RDL | Descent Registered Level |
| .RDL | Paradox |
| .RDL | RadioDestiny Radio Stream |
| .RDL | Symbian Recogniser Library |
| .RDM | Ragdoll Masters Preference File (Ragdoll Soft) |
| .RDO | Oracle Redo Log File |
| .RDO | Xerox Document Assembler Metafile |
| .RDP | Remote Desktop Connection (Microsoft Corporation) |
| .RDPROJ | Report Direct Project File (MRDC Ltd) |
| .RDS | ERMIS Radio Data System |
| .RDS | Ray Dream Studio Native Data Format (Eovia Corporation) |
| .RDT | RDT Tracking File |
| .RDV | NTgraph Borland C 32 File |
| .RDW | Real-DRAW Project (MediaChance.com) |
| .RDX | Reflex Data File (Borland Software Corporation) |
| .RDY | Ready Pro Accounting Database (Codice srl) |
| .RDZ | RemoteDocs File |
| .RDZ | Mandrake Linux Install File |
| .RE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REA | Doc Free Geocom File |
| .REA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .READ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .READM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .README | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .README | Documentation File |
| .README1ST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .READS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REALDOWNLOAD | RealDownload Paused Download (Real.com) |
| .REC | ARCserve Archivation Protocol (Computer Associates International, Inc.) |
| .REC | EpiInfo Data |
| .REC | Payroll Mate 2008 Bank Reconciliation Data (RealTaxTools.com) |
| .REC | Sprint Record File |
| .REC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REC | Easy CD Creator Recovery File (Sonic Solutions) |
| .REC | RapidComm Voice File |
| .REC | Medlin Accounting Bank Reconciliation Data (Medlin Accounting) |
| .REC | EpiData Data File (EpiData Association) |
| .REC | Windows Recorder Macro |
| .REC | ProMash Recipe (Sausalito Brewing Co.) |
| .RECEIVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RECON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RECORDS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RED | Red Faction Level File (THQ Inc.) |
| .RED | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RED | XRK - eXtra Redcode Kit Disassembled RedCode Warrior (Marco Pontello) |
| .RED | Boris Red Project File (Boris FX) |
| .RED | Calrion Modula-2 Path Data |
| .RED | Rational Rose Module Diagram (IBM) |
| .RED | View Redline (Autodesk, Inc.) |
| .RED | Masterpoint Red Points File (ABF Masterpoint Centre) |
| .RED-DWARF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REDSECTOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REDUCTION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REF | Train Simulator Object Reference File (Microsoft Corporation) |
| .REF | Reference |
| .REF | Cross Reference |
| .REF | Pro/ENGINEER Temporary File (PTC) |
| .REF | ReferBib Document |
| .REF | Ad-Aware Signature File (Lavasoft) |
| .REF | Atari ST Guide Ref Links |
| .REF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REFER | ReferBib Document |
| .REFERENCE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REG | Registration Data |
| .REG | Mozilla (Netscape) XPCOM Registry (Mozilla.org) |
| .REG | Registry Data File (Microsoft Corporation) |
| .REGENT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REGET | ReGet Deluxe Downloader |
| .REGISTER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REGULAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REID | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REJ | Energo Registration (Rejestracja) (ZUI TechSoft) |
| .rej | UNIX Rejected Patches |
| .REKO | REKO Cardset (REKO Games) |
| .REL | ACT! Alarm Data File (Best Software CRM Division) |
| .REL | Nokia Phone Audio File (Nokia) |
| .REL | Knowledge Explorer Knowledge Representation Relation |
| .REL | Retrieve 4GL Dataset File (Sage Enterprice Solutions) |
| .REL | PDP-10 Relocatable Object File (Input to LINK-10 or LOADER) |
| .REL | Norton Internet Security 2001 Log File (Symantec Corporation) |
| .REL | Wii Relocatable Module (Nintendo) |
| .RELEASE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RELEASENS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REM | Annotation |
| .REM | ACT! Database Maintenance File (Best Software CRM Division) |
| .REM | Delphi Memory Swap File (Borland) |
| .REMI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REMINDER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REMINDERS | Remind Reminder Script (Roaring Penguin Software Inc.) |
| .REMIX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REMOVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REN | Renai Tsumyu Resshon Tsukuru 2 (Love Lesson Maker 2) (Enterpbrain) |
| .REN | Possibly a Renamed File |
| .REO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REP | Text Document |
| .REP | QWK Reader Reply |
| .REP | Blizzard Game Replay File (Blizzard Entertainment) |
| .REP | ACT! Report Template (Best Software CRM Division) |
| .REP | Organizer Report (IBM) |
| .REP | Grand Theft Auto San Andreas Replay (Rockstar Games) |
| .REP | Complete Works Report (Toplevel Computing) |
| .REP | Business Objects Report (Business Objects SA) |
| .REP | Report File |
| .REPAIRS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPORT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPORTING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPORTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REPX | XtraReports Report Definition File (Developer Express Inc.) |
| .REQ | Request |
| .REQU | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REQUEST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REQUEST1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REQUEST2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RES | FlyFF Resource File (Aeonsoft, Inc.) |
| .RES | Stuttgart Neural Network Simulator Result |
| .RES | C and C++ Compiled Resource (Microsoft Corporation) |
| .RES | C++ Compiled Resource (Borland Software Corporation) |
| .RES | Half Life Game Map |
| .RES | XBoard Resign Conferences File |
| .RES | Resource File |
| .RES | Infinity Game Engine Character Biography (BioWare Corp.) |
| .RES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RES | Evil Islands Archive |
| .RES | Championship Bass Archive |
| .RES11 | MIKE 11 Result File (DHI Water & Environment) |
| .RESCUE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RESID | NML Language Compilation Residual File (NevoSoft) |
| .RESIDENT2 | Resident Evil 2 Saved Game (Capcom) |
| .RESONANCEII | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RESOURCE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RESOURCES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RESOURCESCONFIG | Visual Studio .NET Resources Configuration (Microsoft Corporation) |
| .RESPECT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RESTORE | ISE WebPACK Project Restore File (Xilinx, Inc.) |
| .RESX | Payroll Mate 2008 (RealTaxTools.com) |
| .RESX | NET XML Resource Template (Microsoft Corporation) |
| .RET | RETScreen Project File (RETScreen International) |
| .RET | Basic Realizer Careal Caret Samples |
| .RET | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RETRNTOOLS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RETURNTOOLS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REUNION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REV | Revolution MetaCard Stack (Runtime Revolution Ltd) |
| .REV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REV | Workshare Synergy File |
| .REV | FrameMaker Document (Adobe Systems Incorporated) |
| .REV | Geoworks Revision File |
| .REV | WinRAR Recovery Volume File |
| .REV1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REV5 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REVALVER | ReValver Preset |
| .REVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REVENGE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REVHIST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REVIEW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REVISION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REWARD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REX | PharLab Executable File |
| .REX | REXX Script (IBM) |
| .REX | Oracle Report Definition |
| .REX | ACT! (Best Software CRM Division) |
| .REX | 4th Dimension Database Windows Client Local File (4D, Inc.) |
| .REX | ReCycled Audio Loop Export File |
| .REXX | REXX Script (IBM) |
| .REZ | Purge |
| .REZ | Escape Velocity Nova Plug-in (Ambrosia Software, Inc.) |
| .REZ | LithTech Game Resource File (Touchdown Entertainment, Inc.) |
| .REZ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REZ | Alien vs Predator 2 Game |
| .REZ | Shogo Archive |
| .REZ | Blood 2 Archive |
| .REZ | No One Lives for Ever Archive |
| .REZ | Sanity: Aiken's Artifact Archive |
| .REZ | Resume Divider (Luna) |
| .REZCODE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REZEQUS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .REZREF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RF | FrameMaker Document (Adobe Systems Incorporated) |
| .RF | Sun Raster Graphic |
| .RF | RealFlash Clip |
| .RF? | SmartWare Compiled Project File |
| .RFA | Battlefield 1942 (DEMO) |
| .RFA | Battlefield 1942 Unit/Object Texture Archive (Electronic Arts, Inc.) |
| .RFB | RoboForm (Siber Systems Inc.) |
| .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 | RFG Integrator Householding Database |
| .RFH | Maxagrid CTM Refresh File |
| .RFI | SPEFO Stellar Spectra Analysis File |
| .RFL | RISAFloor Analysis & Design |
| .RFL | Reason Sound Bank (Propellerhead Software) |
| .RFL | ANSYS |
| .RFL | Guardian Database Roll-forward File |
| .RFM | Rich Music Format |
| .RFN | RoboForm Saved Data (Siber Systems Inc.) |
| .RFO | RoboForm Cached Data (Siber Systems Inc.) |
| .RFORK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RFP | AI RoboForm Passcard Database |
| .RFP | RoboForm Saved Data (Siber Systems Inc.) |
| .RFR | Photoshop Frame Filter File (Adobe Systems Incorporated) |
| .RFT | IBM DisplayWrite Revisable Format Text |
| .RFT | Revit Template (Autodesk, Inc.) |
| .RFT | AI RoboForm Form Database |
| .RFX | Modula M2SDS File |
| .RFX | RoboForm Saved Data (Siber Systems Inc.) |
| .RFX | TouchStar License File |
| .RG | Rosegarden Music File |
| .RG | Bitmap Graphic |
| .RGB | Intergraph Raster Graphic (Intergraph Corporation) |
| .RGB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RGB | Intermediate Format Graphic |
| .RGB | Silicon Graphics RGB Bitmap (Silicon Graphics, Inc.) |
| .RGB | Ribbons SGI Image |
| .RGB | Q0 Graphic |
| .RGB | VideoCraft GIF |
| .RGBA | Silicon Graphics RGB |
| .RGD | Rosegarden MIDI Device Definition File |
| .RGE | Inno Setup Registry Entries File |
| .RGE | R.A.G.E. Driver |
| .RGF | regify Encrypted Message (regify AG) |
| .RGF | Advanced Registry Tracer Scan Data (ElcomSoft Co.Ltd.) |
| .RGH | ZZ Rough Image |
| .RGI | RealArcade Game Installer |
| .RGL | Scarlett Expert System Compiler Rules File |
| .RGLR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RGN | Championship Manager Game File |
| .RGN | Garmin Region File (Garmin Ltd.) |
| .RGO | RepliGo Virtual Print File (Cerience Corporation) |
| .RGP | RealArcade Game Package (RealNetworks Inc.) |
| .RGP | Rosegarden Project |
| .RGS | RealArcade Secured Game Installer (RealNetworks Inc.) |
| .RGS | InstallShield Script for Windows Registry (Acresso Software Inc.) |
| .RGU | Data Recovery Software (Kroll Ontrack Inc.) |
| .RGX | ReaGeniX Code Generator Symbol Table |
| .RGZ | Ragnarok EXE and BGM Patch Archive (Gravity Co., Ltd.) |
| .RH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RH | Deep Exploration Repository File (Right Hemisphere) |
| .RH | C++ Resource Header File (Borland Software Corporation) |
| .RHC | ClipX RLIB RHELP Source File |
| .RHL | RatHole Archive (Edge Sounds) |
| .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) |
| .RICONS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RID | GerbMagic Raster Image Data (BronzWare, Inc.) |
| .RIDDLES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIDDLES2F | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIDE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIDE2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIDEOFVALKY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIDGE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIF | Rockwell ADPCM Audio |
| .RIF | FutuRUG Encrypted Resident Information File (Two Brothers Software) |
| .RIF | Recource Interchange File Format Bitmap Image |
| .RIF | Fractal Painter Bitmap |
| .RIF | Raster Image File Format |
| .RIFF | Raster Image File Format |
| .RIFF | Recource Interchange File Format Bitmap Image |
| .RIFF | Audio File |
| .RIFL | Business Integrator Real-Time Integration Flow Language Script (Pervasive Software Inc.) |
| .RIG | LightWave 3D RIG Function File (NewTek) |
| .RIGHT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RII | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIN | RappInfo PostScript Converter Configuration File |
| .RIN | Retrieve 4GL Database Index (Sage Enterprice Solutions) |
| .RING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RIP | Remote Imaging Protocol |
| .RIP | Telegrafx Remote Imaging Protocol |
| .RIP | Quincy Program Crash Report |
| .RIP | RIPcoder Encrypted File (Ruzaev Sergei) |
| .RIP | Notes Error File (IBM) |
| .RIR | Spaceward Satori Family Native |
| .RIS | HDF Zlib File |
| .RIS | Reference Manager RIS Format (The Thomson Corporation) |
| .RIS | Bibliographic Reference 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 | WinRK Archive (M Software) |
| .RKA | RK Archiver / RKAU Audio (M Software) |
| .RKP | RKP Game Package (v1.x) |
| .RKP | REKO PC Cardset (REKO Games) |
| .RKP | RemoteKeys Profile (The OATS Project Consortium) |
| .RKT | RockSim Rocket Design File (Apogee Rockets) |
| .RKV | RKIVE Compressed Archive |
| .RKW | RockWorks Graphic (RockWare, Inc.) |
| .RL | The 7th Guest Archive |
| .RL | FLEXnet Manager Report Log (Acresso Software Inc.) |
| .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 | Run Length RLC Bitmap |
| .RLC | LoopCAD Project (Avenir Software Inc.) |
| .RLC | ArcView Image File (ESRI) |
| .RLC | Scanner One-bit/pixel Grahpic Output |
| .RLC | Image Systems CAD Overlay |
| .RLD | Norton Commander 5.0 Temporary File |
| .RLE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RLE | ADEX Corporation ChromaGraph Graphics Card Bitmap Graphic |
| .RLE | Run Length Encoded Bitmap |
| .RLE | Utah Raster Toolkit Bitmap Image |
| .RLELZW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RLF | ArtCAM Pro Relief File (Delcam plc) |
| .RLG | ReliaSoft ALTA 6 & Weibull++ 6 |
| .RLG | Regcleaner Language File |
| .RLI | RVS-COM Least-cost-routing Tariff Database (Living Byte Software GmbH) |
| .RLL | IP-EPS |
| .RLL | SQL Server Resource Library (Microsoft Corporation) |
| .RLL | Basic Realizer Careal File |
| .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 (RealNetworks, Inc.) |
| .RMB | SafeGuard RemovableMedia Keyring Backup File (Utimaco Safeware AG) |
| .RMC | RMCalc |
| .RMD | Reference Manager Database (The Thomson Corporation) |
| .RMD | RegMaid Document (Microsoft Corporation) |
| .RMD | RateMyDrawings Saved Drawing Data (RateMyDrawings.com) |
| .RMD | IMail Server Mail Message (Ipswitch, Inc.) |
| .RMD | OaapPro Auditing Database File (Resource Management Services, Inc.) |
| .RMD | Report Miner Definition (Retsel Group) |
| .RME | Final Fantasy Sound (Square Enix Co., Ltd) |
| .RME | SB_AWE Keys File |
| .RMF | Rich Map Format |
| .RMF | Beatnik Rich Music Format (Beatnik) |
| .RMF | Acrobat Rights Management Document (Adobe Systems Incorporated) |
| .RMG | RootsMagic Genealogy File (RootsMagic, Inc.) |
| .RMG | ANSYS |
| .RMG | Temporary File |
| .RMH | Rights-managed HTML File (Microsoft Corporation) |
| .RMH | GigaTrust RM-protected File (GigaMedia Access Corporation) |
| .RMI | MIDI File |
| .RMID | RMID Ringtone |
| .RMIX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RMJ | RealAudio Media (RealNetworks, 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 | Open Workbench Project File (Sponsored by CA's Clarity Division (formerly Niku)) |
| .RMP | RealJukebox Track Info Package (RealNetworks, Inc.) |
| .RMR | Resume Maker File |
| .RMS | AutoCAD Data File for Boss RMS |
| .RMS | Rise of Nations Random File (Microsoft Corporation) |
| .RMS | Dynamite VSP Road Marking Style (3am Solutions (UK) Limited) |
| .RMS | RealMedia Secure Media File (Real Networks, Inc.) |
| .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 | Reference Manager Database Indes (The Thomson Corporation) |
| .RMX | RealMedia Secure Media Clip (RealNetworks, Inc.) |
| .RN | Nota Bene XPL Program |
| .RNAM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RND | AutoCAD Autoshade Rendering Slide (Autodesk, Inc.) |
| .RND | Pretty Good Privacy (PGP) Random Seed (PGP Corporation) |
| .RND | PDP-10 RUNOFF Input (Created DOC) |
| .RNG | Top Secret Crypto Gold RSA Key Ring File (TAN$TAAFL Software Company) |
| .RNG | RELAX NG (OASIS RELAX NG TC) |
| .RNG | Random Number Generator Data File (Psytek Ltd.) |
| .RNG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RNG | Nokia Phone Ringtone File (Nokia) |
| .RNK | Dial-up Shortcut |
| .RNL | GTX Runlength Raster Graphics |
| .RNO | VAX Runoff File |
| .RNO | PDP-10 RUNOFF Input (Creates MEM) |
| .RNS | Renoise Professional Music Tracker |
| .RNS | Reason Audio File (Propellerhead Software) |
| .RNT | EdgeCAM Licensing Data Ffile (Pathtrace Engineering Systems) |
| .RNW | Sweave Source File (Friedrich Leisch) |
| .RNX | RealPlayer File (RealNetworks) |
| .ROADS | ROADS++ Documnet |
| .ROAH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROB | Microsoft Art Gallery File |
| .ROB | Real Player (RealNetworks, Inc.) |
| .ROB | MPC-Solution Machine definition file (iAR GmbH) |
| .ROC | SpaceCAD Rocket Design (SpaceCAD.com) |
| .ROCK | Rockbox Executable Application (The Rockbox Crew) |
| .ROCK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROD | e.Report Designer Report Object Design (Actuate Corporation) |
| .ROF | ReliaSoft RG |
| .ROFF | Roff/nroff/troff/groff Unformatted Manual Page (UNIX) |
| .ROI | Shark Sales System Data File (Shark Finesse Ltd) |
| .ROI | e.Report Designer Report Object Instance (Actuate Corporation) |
| .ROIDZ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROL | AdLib Visual Composer Music File |
| .ROL | e.Report Designer Report Object Library (Actuate Corporation) |
| .ROM | Nintento 64 Emulation ROM Image |
| .ROM | MZ700 Emulator |
| .ROM | MSX/MSX2 ROM Image |
| .ROM | Read Only Memory Image |
| .ROM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROND | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROOT | ROOT Data File (Rene Brun & Fons Rademakers) |
| .ROOT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROP | Actuate Parameter Template (Actuate Corporation) |
| .ROQ | Medal of Honor - Allied Assualt |
| .ROQ | Id Software RoQ Movie (id Software) |
| .ROS | Actuate Search Definition (Actuate Corporation) |
| .ROS | Dynamite VSP Rail Object Style (3am Solutions (UK) Limited) |
| .ROS | Notes 5 Full Text Index (IBM) |
| .ROT | Home World 2 ROT Graphics (Sierra Entertainment, Inc.) |
| .ROT | Homeworld Relic's Graphics Format (Sierra Entertainment, Inc.) |
| .ROT | Rotater 3D Image |
| .ROTATE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROU | English Lake District Walker Calculator Route File |
| .ROU | MapSource Route Information (Garmin Ltd.) |
| .ROUT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROUT2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROUTINE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROUTINES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROV | e.Report Designer Report Object Value (Actuate Corporation) |
| .ROV | Rescue Rover Data |
| .ROVER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ROW | RowPro Rowfile (Digital Rowing Inc.) |
| .ROX | e.Report Designer Report Object Executable (Actuate Corporation) |
| .ROY | TrueType |
| .ROZ | aSc TimeTables Timetable File (aSc -- Applied Software Consultants s r.o.) |
| .RP | RealPix Clip (Real Networks, Inc.) |
| .RP | Rainbow Painter |
| .RP0 | RescuePro Physician Invoice File |
| .RP1 | RescuePro Physician Invoice File |
| .RP1 | Database Text; R&R Report File |
| .RP2 | RetroPlatform Player Archive |
| .RP2 | RescuePro Physician Invoice File |
| .RP3 | RescuePro Physician Invoice File |
| .RP3 | Need for Speed Car Race File |
| .RP4 | RescuePro Physician Invoice File |
| .RP4 | Reliance 4 Project File (GEOVAP, spol. s r.o.) |
| .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) |
| .RPA | Ren'py Image Archive (American Bishoujo) |
| .RPB | CP Backup Report |
| .RPB | Radmin (Remote Administrator) Phonebook (Famatech, LLC.) |
| .RPB | Automotive Diagnostic |
| .RPB | RowPro Database Backup (Digital Rowing Inc.) |
| .RPBM | Portable Image |
| .RPC | Rifts Character Generator Character File (5th Gear Productionz) |
| .RPC | 3WayPack (The Three-Mode Company) |
| .RPC | Crystal Reports (Microsoft Corporation) |
| .RPC | Rich Photorealistic Content (ArchVision, Inc.) |
| .RPC | RAR Password Cracker Project (dnSoft Research Group) |
| .RPCP | Reason Resource Package (Propellerhead Software) |
| .RPD | RPV Printing System File |
| .RPD | Rapidfile Database |
| .RPD | RosaPro File |
| .RPF | AutoCAD Raster-pattern Fill Definition (Autodesk, Inc.) |
| .RPF | Raven Check Convertor Payment File (DeepCove Labs) |
| .RPF | ProWORX Nxt Cross-reference Pointer (Schneider Electric) |
| .RPF | Grand Theft Auto IV RAGE Engine Package File (Rockstar Games) |
| .RPG | RPG Toolkit Game Code (Phil Carty) |
| .RPG | O.H.R.RPG.C.E Role-Playing Game (Hamster Republic Publications) |
| .RPGM | Portable Greyscale |
| .RPIN | InDesign Import/Export Filter (Adobe Systems Incorporated) |
| .RPJ | Relex |
| .RPK | NeverForget Backup Reminder File (National Creative Registry, Inc.) |
| .RPK | Rippack File |
| .RPK | RadLight Skin |
| .RPL | Reply Message |
| .RPL | Escape Replay (Compressed Video) File (Eidos) |
| .RPL | Replica Text File |
| .RPL | ARMovie Video |
| .RPL | Systems Management Server (SMS) Replication File With No Transaction Processing (Microsoft Corporation) |
| .RPL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RPL | Toribash Replay Game File (Nabi Studios Pte Ltd) |
| .RPL | Crystal Reports for Visual dBASE Label File |
| .RPLN | InDesign Required Funcation Library (Adobe Systems Incorporated) |
| .RPM | RealMedia Player Plug-in (RealNetworks) |
| .RPM | RunPaint Multicolor Graphic |
| .RPM | RedHat Package Manager |
| .RPM | LINUX Package |
| .RPMS | Source Package Manager File (Red Hat, Inc.) |
| .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) |
| .RPS | V-Ray Render Preset (Chaos Group) |
| .RPT | Report |
| .RPT | Crystal Reports Output File (Report) (Crystal Decisions) |
| .RPT | MicroSim PCBoard Reports Reflecting Autorouting Progress and Statistics |
| .RPT | Systems Management Server (SMS) Replication File With Transaction Processing (Microsoft Corporation) |
| .RPT | Sierra Mastercook Cookbook File |
| .RPT | TeamQuest View Report Syntax (TeamQuest Corporation) |
| .RPT | TrueNet Print Template File (R-Quest Technologies, LLC) |
| .RPT | Visual Basic Crystal Reports File (Microsoft Corporation) |
| .RPTDESIGN | BIRT Report Design (Actuate Corporation) |
| .RPTDOCUMENT | BIRT Report Document (Actuate Corporation) |
| .RPTLIBRARY | BIRT Report Design Library (Actuate Corporation) |
| .RPTTEMPLATE | BIRT Report Design Template (Actuate Corporation) |
| .RPV | Real Player Visualization File |
| .RPV | Listlabl File |
| .RPV | RPV Printing System File |
| .RPV | Rebel Strip Poker Main Oopponent Video File (Rebel Software) |
| .RPW | RPWiz Project |
| .RPX | Oracle Visual Information Retrieval Raw Pixel Format File |
| .RPX | Repute Tutorial File |
| .RPX | Electronic Storage Corporation Laser Vault Index |
| .RPY | Star Wars - Tie Fighter Media |
| .RPY | Twisted Web Web Resource (Twisted Matrix Laboratories) |
| .RPY | Ren'py Game Script File (American Bishoujo) |
| .RPY | Grand Prix Legends Racing Simulation Game File |
| .RPYC | Ren'py Pre-compiled Game Script File (American Bishoujo) |
| .RPZ | Crystal Reports Encrypted and Zipped Report File (Crystal Decisions) |
| .RQF | R-Quest Duplication Systems Firmware Update File (R-Quest Technologies, LLC) |
| .RQI | TrueNet R-Quest Disc Image File (R-Quest Technologies, LLC) |
| .RQS | Rational RequisitePro Project (IBM) |
| .RQY | Excel OLE DB Query File (Microsoft Corporation) |
| .RR | Railroad Tycoon (PopTop Software Inc.) |
| .RRA | Windows Installer Temporary Data (Microsoft Corporation) |
| .RRB | RoboRally Board Editor Board File (Norbert Langernamm) |
| .RRD | RapidReader Document (SoftOlogy IdeaWorks, LLC) |
| .RRD | RRDtool Round-Robin Database (OETIKER+PARTNER AG) |
| .RRD | ERDAS IMAGINE (Leica Geosystems , LLC) |
| .RRF | Raytech Navigator (Raymarine) |
| .RRF | Registry Engineer Registry Backup (ArcaneWooD software) |
| .RRF | Musicmatch Jukebox File |
| .RRGT | REALrunner Lite Graphics Theme (Gryphonclaw Software) |
| .RRI | SPEFO Stellar Spectra Analysis File |
| .RRP | Running Time Logger Profile File (Hizx Productions Software) |
| .RRS | Road Rash Save File |
| .RRSE | REALrunner Lite Sound Effect (Gryphonclaw Software) |
| .RS | EROSION 3D Event File |
| .RS | Amiga Reassembler Resource Data (Amiga) |
| .RS | dnaLIMS Reaction Sheet (dnaTools) |
| .RS | RapidSketch Sketch Document (Utilant, LLC) |
| .RS | Sun Raster Graphic |
| .RS1 | RETScreen System File (RETScreen International) |
| .RS6000 | RS 6000 Make File |
| .RSA | PKCS7 Signature, MD5 + RSA |
| .RSAKEY | Top Secret Crypto Gold RSA Key File (TAN$TAAFL Software Company) |
| .RSB | Rainbow Six: Rogue Spear Bitmap (Red Storm Entertainment, Inc.) |
| .RSB | ReliaSoft BlockSim |
| .RSB | Red Storm Image Format |
| .RSC | Carnivores / Ice Age Map Areas (Action Forms, Ltd.) |
| .RSC | Maptitude GISDK Compiled Resource (Caliper Corporation) |
| .RSC | MicroStation Symbology Resources (Bentley Systems, Incorporated) |
| .RSC | Resource File |
| .RSC | Pegasus Mail Resource File (David Harris) |
| .RSC | SymbianOS Application Resource File (Symbian Software Ltd) |
| .RSC | Compiled Resource |
| .RSC | NASCAR Racing 2002 Paint Shop Controller File (Sierra) |
| .RSD | Resort Software Database (Resort Software Pty. Ltd.) |
| .RSD | Roland Visual MT File |
| .RSD | Scanner Recognita file |
| .RSF | Reflection Setting File (WRQ) |
| .RSF | NEi Nastran Results Summary File (Noran Engineering, Inc.) |
| .RSF | ReliaSoft BlockSim |
| .RSF | Mediafour MacDrive Macintosh Resource Fork |
| .RSG | Drakan: Order Of The Flame Saved Game (Surreal Software, Inc.) |
| .RSG | EPOC Compiled Resource Header |
| .RSH | 3DReshaper Project (TECHNODIGIT - a Department of The MBPS-AIRINDEX Group) |
| .RSH | Warhammer 40,000 Texture (THQ Inc.) |
| .RSK | RiskMan Risk Project |
| .RSL | Paradox |
| .RSL | PageMaker (Adobe Systems Incorporated) |
| .RSL | Robot Scripting Language |
| .RSL | PC Tools Resources Library |
| .RSL | Paradox Version 7 Report (Borland Software Corporation) |
| .RSL | ReliaSoft ALTA 6 |
| .RSM | ReliaSoft MPC 3 |
| .RSM | RuneSword II Game |
| .RSM | WinWay Deluxe Resume File |
| .RSM | Resume |
| .RSML | Real Player File |
| .RSOUND | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RSP | ReliaSoft BlockSim |
| .RSP | Linker Response File |
| .RSP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RSP | MDaemon File |
| .RSP | ODBC Driver Configuration File (Microsoft Corporation) |
| .RSP | ReadSay Phrase Library (ReadSay Literacy Consulting) |
| .RSP | Responce Text File |
| .RSP | Workshare Synergy Response File |
| .RSP | Rational Project Project (IBM) |
| .RSP | Rockwell Software Logix 5 File |
| .RSP | Universal Installer Response File (Oracle) |
| .RSR | 4th Dimension Database Resource Fork (4D, Inc.) |
| .RSRC | Mac OS Resource File |
| .RSRC | Xcode Compiled Rez Program (Apple Inc.) |
| .RSRC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RSRT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RSS | PlanMan Image (Invarion Pty Ltd) |
| .RSS | EPOC Resource Source File |
| .RSS | Rockwell Logix 500 SLC-5 Software (Rockwell Automation, Inc.) |
| .RSS | RSS File |
| .RSS | ReliaSoft BlockSim |
| .RST | ANSYS Results |
| .RST | AVG System Restore Files (AVG Technologies) |
| .RST | Report Sharp-Shooter Report Template (Perpetuum Software) |
| .RST | SaralTDS eTDS Software Quarterly Report (Relyon Softech Ltd.) |
| .RST | IBM Voice Type Language Scripts Data File |
| .RST | ReliaSoft BlockSim |
| .RST | VGA Planets Game File (Tim Wisseman) |
| .RSTRNT | Insight II Distance, Torsion, Chiral, and NOE Volume Restraints (Accelrys Software Inc.) |
| .RSW | ReliaSoft BlockSim |
| .RSY | FLEXIT Multishot Survey Raw Data File (Flexit AB) |
| .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 |
| .RTAB | RandyTab Guitar Tablature |
| .RTB | Rhino 3D Toolbar Collection File (post-Sept 2003) (Robert McNeel & Associates) |
| .RTC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RTC | Rescue Me File |
| .RTD | RagTime Document (RagTime GmbH) |
| .RTD | Retina Network Security Scanner Output File (eEye Digital Security) |
| .RTD | ROBOT Structure File (RoboBAT) |
| .RTE | Microsoft Exchange Server WinRoute Routing Table Dump (Microsoft Corporation) |
| .RTE | RTEncoder RTE Encoded File (RTEncoder) |
| .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 Inc.) |
| .RTFENX | egis Encrypted RTF File (HiTRUST Inc.) |
| .RTH | ANSYS Results |
| .RTK | RoboHelp Configuration |
| .RTL | Norton Utilities 7.0 Runtime Library |
| .RTL | Borland Runtime Library (Borland Software Corporation) |
| .RTL | HP Color Printer Raster Transfer Language (Hewlett-Packard Development Company, L.P.) |
| .RTL | Text File |
| .RTLIST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RTM | Real Tracker Module/Song |
| .RTM | ReliaSoft RG |
| .RTMDL | Rational Rose RealTime Model (IBM) |
| .RTP | TurboTax Update File (Intuit) |
| .RTP | Gerber Sign-making Software File |
| .RTP | Patch File (Microsoft Corporation) |
| .RTP | RTPatch Update Package |
| .RTPI | 3rdTech Scanner File |
| .RTPL | Nokia Phone Ring Tone (Nokia) |
| .RTR | IBM Voice Type Language Vocabels File |
| .RTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RTS | Resource Tuner Console Script (Heaventools Software) |
| .RTS | QuickTime Real-Time Streaming Protocol File (Apple Inc.) |
| .RTS | RoboHelp Configuration |
| .RTS | RIT Multilingual Transliteration Scheme |
| .RTS | Realizer Runtime Library |
| .RTS | RealAudio RTSL Document |
| .RTSP | QuickTime Real-Time Streaming Protocol File (Apple Inc.) |
| .RTT | RagTime Stationery Pad (RagTime GmbH) |
| .RTTTL | Ring Tones Text Transfer Language File |
| .RTV | NewTek Products Uncompressed Video (NewTek) |
| .RTWKS | Rational Rose RealTime Model (IBM) |
| .RTX | Rich Text Document |
| .RTX | Mobile Phone Ringtone |
| .RTX | Reliacast Audience Manager Turnstile |
| .RT_ | Winhelp Compressed File |
| .RU | Javasoft JRE 1.3 Library File |
| .RUBY | Ruby Software File (Ruby Software) |
| .RUF | ProWORX Nxt Address Used Tables Reference (Schneider Electric) |
| .RUI | SPEFO Stellar Spectra Analysis File |
| .RUJ | Oracle Recovery-Unit Journal |
| .RUL | InstallShield Rules File (Acresso Software Inc.) |
| .RUL | Expert System Rule |
| .RUL | SpamAI Spam Rule Repository (DAIR Computer Systems) |
| .RUL | TurboTax Rule File (Intuit) |
| .RUL | Echo-conference Rules |
| .RULER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .rules | UNIX Rules File |
| .RUMMY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RUN | Rune Map (Human Head Studios) |
| .RUN | Runscanner Automatic Startup Information File (Runscanner) |
| .RUN | UNIX Shell Installer Script |
| .RUN | PC Tools Script Tools Program |
| .RUN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RUN | AMOS Executable File (Alpha Micro) |
| .RUN | ISAPI Loader Current ISAPI Application (EGGcentric) |
| .RUN | Softworks Basic Compiled Pseudo Code (Softworks Limited) |
| .RUNNER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RUNQ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RUS | Navitel Navigator Ver 1.1 Map (GPS Moldova) |
| .RUS | Russian Text |
| .RUSH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RUSHERS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RV | SPEFO Stellar Spectra Analysis File |
| .RV | RealVideo Clip (Real Networks, Inc.) |
| .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) |
| .RVE | Resolve-It Data File (Ampersand Design) |
| .RVF | TNTmips DOS Version Project File (MicroImages, Inc.) |
| .RVG | Revit External Group File |
| .RVI | Revenant Archive |
| .RVL | muvee Project (muvee Technologies Pte. Ltd.) |
| .RVM | Revenant Archive |
| .RVML | Rich Vector Markup Language (Kinesis Software Ltd.) |
| .RVN | Riven Saved Game |
| .RVP | Scan Configuration File (Microsoft Corporation) |
| .RVP | C|Net CatchUp File |
| .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 | VersaPro Reference View Table |
| .RVT | Revit Design Setup File |
| .RVT | Incite Media Assistant File |
| .RVW | Review |
| .RVX | Reflection Web Launch (WRQ) |
| .RVX | RealVideo Streaming File (Protected) (Real Networks, Inc.) |
| .RW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RW | Boso View Express Railway Definition File (Mackoy) |
| .RW3 | RapidWeaver Site Design File (Realmac Software Limited) |
| .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 | MENSI Realworks Survey |
| .RWP | IBM Configurator Report |
| .RWS | MENSI Realworks Survey |
| .RWS | REDIPlus Workspace (REDIProducts) |
| .RWS | C++ Resource Workshop Symbol File (Borland Software Corporation) |
| .RWSD | RWSD Audio Stream |
| .RWT | HyperRESEARCH Plug-in Tool (ResearchWare, Inc.) |
| .RWX | MEME Shape File |
| .RWX | RenderWare Script |
| .RWX | Netscape Live 3D |
| .RWZ | Outlook Rules Wizard File (Microsoft Corporation) |
| .RX | EARS Component File |
| .RX | DOS 7 File |
| .RX | Reflex Database Driver (Borland Software Corporation) |
| .RX | E3 Security Kit Prescription File (radsoft.net) |
| .RX2 | ReCycle! Format Audio Loop (Propellerhead Software) |
| .RXC | Easy CD Creator Drag to Disk File (Sonic Solutions) |
| .RXC | Reflection X Client File (WRQ) |
| .RXD | Reflex Database (Borland Software Corporation) |
| .RXE | Lego Mindstorms Robotics Invention System Executable File (The LEGO Group) |
| .RXF | Recipe Exchange Format (Resort Software Pty. Ltd.) |
| .RXF | Resco Encrypted File (Resco, sro) |
| .RXH | Reflex Database Help File (Borland Software Corporation) |
| .RXL | Seetrax Ranger PCB CAD Design File (Seetrax CAE Ltd) |
| .RXML | Roxen WebServer RoXen Macro Language (Roxen Internet Software AB) |
| .RXN | MDL Molfile Reaction Format (MDL Information Systems, Inc.) |
| .RXP | Easy CD & DVD Creator 6 Playlist (Sonic Solutions) |
| .RXPROJ | RPG Maker XP Project File (Enterbrain, Inc.) |
| .RXR | Reflex Database Report (Borland Software Corporation) |
| .RXS | Reflex Database Screen Driver (Borland Software Corporation) |
| .RXS | RSIGuard RSIScript File (Remedy Interactive, Inc.) |
| .RXS | AudioCentral Roxio Markup Sound (Sonic Solutions) |
| .RXS | Easy CD & DVD Creator 6 Markup Sound (Sonic Solutions) |
| .RXS | ooRexx Script File (Rexx Language Association) |
| .RYTHME | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .RZ | rzip Compressed Archive (Andrew Tridgell) |
| .RZR | in-sync Speed Razor Project File |
| .RZX | File Crypt Encrypted File (Red Zion) |
| .RZX | in-sync Speed Razor Project File |
| .RZX | RamSoft's ZX Spectrum Replay |