A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Num Sym
.??_ Files ending in "_" are often compressed install files of the same name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.) .R Pegasus Mail Resource File Rebol Script Progress Compiled Program File Ratfor FORTRAN Preprocessor File [FORTRAN] .R?? RAR Compressed File (?? can be 00 to 99) .R1A Yamaha RM1x Dance-Music Workstation .R2A Yamaha RS7000 Music Production Studio Sequencer .R2D RISA-2D Simple Analysis & Design .R2K Repertoire 2000 Music Database .R2P Yamaha RS7000 Music Production Studio Sequencer .R33 Train Simulator Game File .R3A Yamaha RS7000 Music Production Studio Sequencer .R3D RISA-3D 3D Analysis & Design .R3P Yamaha RS7000 Music Production Studio Sequencer .R64 Top Secret Crypto Gold File .R8 RAW Graphic File Flight Simulator Texture File .R8L LaserJet Landscape Font .R8P LaserJet Portrait Font .RA RealMedia File [IrfanView] .RA6 ReliaSoft ALTA 6 (Accelerated Life Testing Analysis Software) .RAC Conversation with Racter (DOS-based AI program) Screen Subtitling Systems Win2020 Screen Subtitle .RAD Radiance Scene Description Format [XnView] .RAI SPEFO Stellar Spectra Analysis File .RAM RealMedia Metafile .RAN Dexterpen File (Parametric 2D design and calculation) .RAP Rapanalyst File (Rapid Application Predictive Technology Organization Resource) Rapidocs Document .RAQ Colbalt Server Backup .RAR RAR Compressed Archive Java JCA Resource Adapter Module .RAS Sun Raster Graphic [XnView] [IrfanView] Cals Raster File [SwiftView] Max Payne Data File Sky Subtracted Data .RASMOL RasMol File (molecular graphics) .RASMOLRC RasMol Configuration File (molecular graphics) .RAST Sun Raster Graphic [XnView] .RAT Rating System File Rats Data Nimbus 7 SAMS Data File (radiance data) .RAW RAW RGB 24-bit Graphic [XnView] Raw Signed PCM Data Sentry 2020 Encryption File VitaGraph File (medical testing related) Nimbus 7 SAMS Data File (radiance data) HSI Raw File [XnView] Spectrum Raw Memory Dump V41/eV41 Program Files Raw Data for CD-ROM Writing (Nero) .RAX Image File .RB RocketEdition File Ruby Interpreter Program .RB? Anti-Virus Backup File (Used by Trend, et.al. - ? = 0-9) .RB1 R:Base Data File .RB2 R:Base Data File .RB3 R:Base Data File .RB4 R:Base Data File .RBB Top Secret Crypto Gold File .RBF R:Base Data File Oracle Backup File Microsoft Rollback File (backup of existing file stored in hidden config.msi directory) .RBH RoboHelp Configuration .RBI eBahn Reader (Automotive technical repair information - eBahn Content Packs) .RBM Propellerhead ReBirth Modulation v2.0 Rail Baron Player Map .RBN Richard's Bridge Notation Real Sound File .RBO Sometimes associated with the Magistr.B Worm [Worm Info] .RBPM POrtable Bitmap [XnView] .RBS Propellerhead Software ReBirth Song Rutherford Backscattering Spectroscopy Analysis Package (RUMP) Microsoft Rollback Script (see .RBF) .RBX XStream Multimedia Simulation Format .RBZ Rail Baron Player Saved Game .RC Borland C++ Resource Compiler Script File Emacs Configuration .RC2 ReCycle v.2 Audio Loop .RCD PC Anywhere Recorded Session File .RCG Netscape Newsgroup File (NETSC.RCG) .RCH SWAT Reach Output File (river basin scale model) .RCI SPEFO Stellar Spectra Analysis File .RCM Logos Library System 2.x Verse Map Polarmap Calculator Configuration Technics Keyboard Rhythm Custom File .RCP Recomposer's MIDI Sequencer Music File .RCS Colin McRae Rally Save Game File (unverified) .RCX Lego Mindstorms Robotics Invention System .RCY ReCycled Audio Loop .RD Philips Raw Data (crystalography related) .RD1 Descent1 Registered Level File DATAIR Retirement Document System Data File .RD2 DATAIR Retirement Document System Custom Text File .RD3 Ray Dream Designer Graphics CorelDream 3D .RD4 Ray Dream Designer Graphics .RD5 Ray Dream Designer Graphics .RDA Oracle Storage Area File .RDB TrueVector Rules Database ZoneAlarm Rules Database (IAMDB.RDB file) Gear CD Suite File Oracle Database Root File Wavelet Image Recording (often found with .60D file) .RDD ReliaSoft ALTA 6 & Weibull++ 6 (ReliaSoft's Reliability Software) .RDF Resource Description Framework File Geoworks UI Compiler Source Code Chromeleon Report Definition Workshare Synergy Collaboration Response File Burli Newsroom System File Oracle Report Binary Source Rate Description File (BLDRATE.EXE output) ProWORX Nxt Cross-reference Data (Found in the NxT directory) Nuzzler Basic Rule Definition File .RDI Device-independent Bitmap SPEFO Stellar Spectra Analysis File .RDJ JCanyon: Grand Canyon for Java DEM File in JPEG Format (see .BSF) .RDL Descent Registered Level RadioDestiny Radio Stream Symbian Recogniser Library (allows OS to recognize document formats) .RDO Oracle Redo Log File Xerox Document Assembler Metafile (defines how Docutech print a group of pages) .RDP Remote Desktop Connection .RDS Ray Dream Studio File ERMIS Radio Data System (Various Radio data system Encoders - located in same folder as an RDS encoder control program and only used by that program) .RDT RDT Tracking File (capture design process and manage the system requirements) .RDX Reflex Data File .RDZ RemoteDocs File Mandrake Linux Install File .REALDOWNLOAD RealDownload Paused Download .REC Sprint Record File EpiInfo Data Windows Recorder Macro RapidComm Voice File .RED Calrion Modula-2 Path Data AutoDesk View Redline File .REF Cross Reference .REG Registry Data File (for updating Windows registry) Registration Data (various) .REGET ReGet Deluxe Downloader .REL Nokia Audio File ACT! Contact Manager for Windows Knowledge Explorer Knowledge Representation Relation Retrieve 4GL Dataset File (The Retrieve 4GL product is used in the creation of many different large database applications so this extension and its link to Retrieve 4GL may show up in products from many companies.) .REM Annotation (remark) .REP Text Document Report File (various) Blizzard Entertainment Replay File Qwk Reader Reply .REQ Request .RES Resource File (various programs) Championship Bass Archive [Dragon UnPACKer] Evil Islands Archive [Dragon UnPACKer] Half Life Game Map [Maps] [Viewers] Infinity Game Engine Character Biography (IWD only) [More Info] .RESX Microsoft .NET XML Resource Template .REV Geoworks Revision File Workshare Synergy File WinRAR Recovery Volume File .REVALVER ReValver Preset (Guitar Amplifier Simulation) .REX REXX Program File Oracle Report Definition ReCycled Audio Loop Export File 4D Database Windows Client Local File ACT! Contact Manager for Windows .REZ Resource File Aliens and Predator 2 Game File Blood 2 Archive [Dragon UnPACKer] No One Lives for Ever Archive [Dragon UnPACKer] Sanity: Aiken's Artifact Archive [Dragon UnPACKer] Shogo Archive [Dragon UnPACKer] Resume Divider (split and combine large files) (Link is to Japanese site) .RF Sun Raster Graphic RealFlash Clip .RF? SmartWare Compiled Project File (requires login) .RFA Battlefield 1942 Unit/Object Texture Archive [BF 1942 Tutorials] (Textures themselves are .DDS files) .RFB RoboForm .RFD RecogniFORM Form Definition Emperor: Battle for Dune Archive [Dragon UnPACKer] .RFF Maggi Graphic File .RFG RFG Integrator System Database .RFH RFG Integrator Householding Database Maxagrid CTM Refresh File (text format) .RFI SPEFO Stellar Spectra Analysis File .RFL RISAFloor Analysis & Design Reason Sound File Guardian Database Roll-forward File ANSYS File (simulates multiphysical interactions) .RFP AI RoboForm Passcard Database .RFT IBM DisplayWrite Revisable Format Text AI RoboForm Form Database .RFX TouchStar License File (unverified) .RGB Q0 Graphic [XnView] Silicon Graphics RGB [XnView] Ribbons SGI Image (Molecular graphics software) .RGBA Silicon Graphics RGB [XnView] .RGI RealArcade Game Installer (not secured) .RGL Scarlett Expert System Compiler Rules File (Scarlett is not presently available) .RGN Championship Manager Game File .RGP RealArcade Game Package .RGS RealArcade Game Installer (secured) .RGU Data Recovery Software (File: ....\ONTRACK\FIX-IT\REGFIX\*.RGU) .RGX ReaGeniX Code Generator Symbol Table .RH Borland C++ Resource Header File .RHC ClipX RLIB RHELP Source File (source to compile into Windows .HLP file) .RHP Rhino Layer Dialog .RI Lotus File .RIA Alpharel Group IV Raster Graphics File .RIB 3D Reality Renderman Format Graphics .RIC Ricoh FAX Graphic File .RIF Fractal Painter Bitmap Raster Image File Format .RIFF Raster Image File Format .RIN RappInfo PostScript Converter Configuration File Retrieve 4GL Database Index (The Retrieve 4GL product is used in the creation of many different large database applications so this extension and its link to Retrieve 4GL may show up in products from many companies.) .RIP Remote Imaging Protocol Lotus Notes Error File .RIS Bibliographic Reference File [XML Converter] .RIT Velrita Document File (DOS word processing) .RIV CRiSP Harvest File .RIX ColorRIX VGA Paint File [XnView] RIX Virtual Screen .RK RK Software RK Archiver .RKV RKIVE Compressed Archive .RL The 7th Guest Archive [Dragon UnPACKer] .RL1 Descent1 Registered Level File .RL2 Descent2 Registered Level .RL4 Bitmap Graphics .RL8 Bitmap Graphics .RLA Advanced Visualizer File Wavefront Raster Image .RLB Harvard Graphic File (Harvard Graphics taken over by Serif) Insight II Residue Library .RLC Image Systems CAD Overlay (RLC2 Graphic) [XnView] Scanner One-bit/pixel Grahpic Output ArcView Image File (run-length coding) .RLE Graphic (Run Length Encoded) [XnView] [IrfanView] Utah Raster Image [XnView] .RLG ReliaSoft ALTA 6 & Weibull++ 6 (ReliaSoft's Reliability Software) .RLL Microsoft SQL Server Resource Library IP-EPS (International Parallel Editor Programmer Simulator) (Editor for IP PLC Relay Lader Logic programs) .RLT ReliaSoft BlockSim & Weibull++ 6 (ReliaSoft's Reliability Software) .RLW ReliaSoft ALTA 6 & BlockSim & Weibull++ 6 (ReliaSoft's Reliability Software) .RLZ Realizer Source Code .RM RealMedia File .RMC RMCalc (restraint moments in precast prestressed concrete girder bridges) .RMD RegMaid Document .RMF Rich Map Format (3D Games) Acrobat Rights Management Document .RMG ANSYS File (simulates multiphysical interactions) In some lists as a Temporary File RootsMagic Genealogy File .RMI MIDI File [IrfanView] .RMJ Real Jukebox File .RMK Clipper RMake Make File .RML Redline Markup Language File (XML-based exchange of design markup and redline information) .RMM RealPlayer File .RMO Selectica RateBuilder (create rate models) .RMP RIFF MP3 Audio File [use Winamp] .RMR Resume Maker File .RMS AutoCAD Data File for Boss RMS (River Modelling System) Secure RealMedia File .RMVB RealVideo Variable Bit Rate File .RMX RealJukeBox MP3 File .RN Nota Bene XPL Program .RND AutoCAD Rendering Slide AutoShade Format .RNG Nokia Ringtone File Top Secret Crypto Gold File .RNL GTX Runlength Raster Graphics .RNO VAX Runoff File .RNS Renoise Professional Music Tracker .RNX RealPlayer File .ROF ReliaSoft RG (Reliability Growth Analysis Software) .ROI Actuate ReportBlast File .ROL Adlib Music File .ROM Nintento 64® Emulation ROM Image (actually most any emulator or BIOS flasher) MZ700 Emulator (MZ700.ROM) .ROQ Medal of Honor - Allied Assualt Quake 3 Arena Movie [MPlayer Linux Viewer] .ROV Rescue Rover Data .ROX Actuate ReportBlast File .RP RealPix Clip Rainbow Painter [XnView] .RP? RescuePro Physician Invoice File (? can be 0-9) .RPB Automotive Diagnostic File .RPBM Portable Image [XnView] .RPC Rich Photorealistic Content (ArchVision, Inc.) [Info] .RPD Rapidfile Database RPV Printing System File RosaPro File (Timetable schedules) .RPF AutoCAD Raster-pattern Fill Definition ProWORX Nxt Cross-reference Pointer (For database listing - Found in the NxT directory) .RPGM Portable Greyscale [XnView] .RPIN Adobe InDesign Import/Export Filter .RPJ Relex (Reliability Analysis Software) .RPK Rippack File RadLight Skin .RPL Replica Text File .RPM RedHat Package Manager (Linux Library) RealMedia Player File RunPaint Multicolor Graphic [XnView] .RPNM Portable Image [XnView] .RPPM Portable Image [XnView] .RPS Propellerhead Software Reason Song Borland Translation Repository .RPT Report (various) MicroSim PCBoard Reports Reflecting Autorouting Progress and Statistics Crystal Reports Output File Sierra Mastercook Cookbook File .RPV Real Player Visualization File (animated effects to beat of music) RPV Printing System File Rebel Poker Player File (Note: Strip poker with nude graphics) .RPW RPWiz Project (slide show development) .RPX Repute Tutorial File Oracle Visual Information Retrieval Raw Pixel Format File [MIME: image/x-ora-rpix] Electronic Storage Corporation Laser Vault Index .RPY Star Wars - Tie Fighter Media Grand Prix Legends Racing Simulation Game File .RQY Microsoft Excel OLE DB Query File [Buy Office XP at Shop.Microsoft] .RR Railroad Tycoon .RRD ERDAS Imagine File (remote sensing) .RRF Raymarine Raytech Navigator (Sailing GPS software) .RRI SPEFO Stellar Spectra Analysis File .RRS Road Rash Save File .RS Amiga Reassembler Resource Data File EROSION 3D Event File [Format (pdf)] Sun Raster Graphic [XnView] .RS_ Macintosh File Resource Fork ArcView Image File (raster snapshot | Sun rasterfile) .RSB Rogue Spear Bitmap Red Storm Image Format [XnView] ReliaSoft BlockSim (System Reliability Software) .RSC Resource File SymbianOS Application Resource File (application resources) Sierra NASCAR Racing 2002 Paint Shop Controller File .RSD Roland Visual MT File (music tutor) .RSF Mediafour MacDrive Macintosh Resource Fork ReliaSoft BlockSim (System Reliability Software) .RSL PC Tools Resources Library Borland's Paradox 7 Report Adobe Pagemaker File ReliaSoft ALTA 6 (Accelerated Life Testing Analysis Software) .RSM RuneSword II Game Resume (often an Microsoft Word file) WinWay Deluxe Resume File ReliaSoft MPC 3 (MSG-3 Aircraft Maintenance Program Software) .RSML Real Player File .RSN Propellerhead Reason Audio File .RSP Responce Text File Microsoft ODBC Driver Configuration File (Installation direcives used setting up Microsoft Universal Data Access services) Rockwell Software Logix 5 File Workshare Synergy Response File MDaemon File ReliaSoft BlockSim (System Reliability Software) .RSR 4D Database Resource Fork File (.4D? for data fork) .RSRC Mac OS Resource File .RSS Rockwell Logix 500 SLC-5 Software ReliaSoft BlockSim (System Reliability Software) .RST ANSYS Results (simulates multiphysical interactions) ReliaSoft BlockSim (System Reliability Software) .RSTRNT Insight II Distance, Torsion, Chiral, and NOE Volume Restraints .RSW ReliaSoft BlockSim (System Reliability Software) .RT Real Media File .RTA RoboHelp Configuration .RTE MicroSim PCBoard Routes Established By a Successfully Completed Autorouting Run .RTF Rich Text Format File (also used as Windows Help file script) .RTH ANSYS Results .RTK RoboHelp Configuration .RTL Text File NU 7.0 Runtime Library Borland Runtime Library .RTM Real Tracker Music Module ReliaSoft RG (Reliability Growth Analysis Software) .RTP TurboTax Update File RTPatch Update Package Gerber Sign-making Software File .RTS RoboHelp Configuration RealAudio RTSL Document Realizer Runtime Library Quicktime Real-Time Streaming Protocol File RIT Multilingual Transliteration Scheme .RTSP Quicktime Real-Time Streaming Protocol File .RTX Reliacast Audience Manager Turnstile Mobile Phone Ringtone (extended ringtone format) .RUF ProWORX Nxt Address Used Tables Reference (Found in the NxT directory) .RUI SPEFO Stellar Spectra Analysis File .RUJ Oracle Recovery-Unit Journal .RUL InstallShield Rules File .RUN PC Tools Script Tools Program .RV RealVideo Clip SPEFO Stellar Spectra Analysis File .RVB Rhino Script File .RVD VPHybridCAD V7 File (Raster/Vector conversion, raster editing) .RVG Revit External Group File .RVI Revenant Archive [Dragon UnPACKer] .RVM Revenant Archive [Dragon UnPACKer] .RVN Riven Saved Game .RVP Microsoft Scan Configuration File C|Net CatchUp File Mime Type: application/x-mss-scancfg .RVR SPEFO Stellar Spectra Analysis File .RVS Revenant Archive [Dragon UnPACKer] .RVT Apache Rivet Tcl File IEX Workforce Management Report (text file) Incite Media Assistant File Revit Design Setup File VersaPro Reference View Table .RVW Review (may just be text file) .RW5 Tripod Data Systmes Survey Pro Data File (Surveyor data collection) .RW6 ReliaSoft Weibull++ 6 (Life Data Analysis Software) .RWA ReliaSoft Weibull++ 6 (Life Data Analysis Software) .RWD Symphonie Raw Wind Data .RWG Random Word Generator .RWMT ReliaSoft Weibull++ 6 MT (Machine Tool Industry Life Data Analysis Software) .RWP IBM Configurator Report (if you don't have the program ask the sender to export to .RTF for you) MENSI Realworks Survey (3D pointcloud analysis) .RWS Borland C++ Resource Workshop Data File MENSI Realworks Survey (3D pointcloud analysis) .RWX RenderWare Script .RWZ Microsoft Outlook Rules Wizard File .RX Reflex Database Driver EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E] .RX2 Propellerhead Software ReCycle! Format .RXC WRQ Reflection X Connection .RXD Reflex Database .RXF Recipe Exchange Format (Resort Software format for chef/food & beverage manager data exchange) .RXH Reflex Database Help File .RXN MDL RxnFile (MIME type chemical/x-mdl-rxnfile) .RXR Reflex Database Report .RXS Reflex Database Screen Driver .RZR in-sync Speed Razor Project File .RZX in-sync Speed Razor Project File