.??_ 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)
.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
.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
.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
.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)
.RDI Device-independent Bitmap
SPEFO Stellar Spectra Analysis File
.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
.RDT RDT Tracking File (capture design process and manage the system requirements)
.RDX Reflex Data File
.RDZ RemoteDocs File
Mandrake Linux Install File
.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
.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
.REX REXX Program File
Oracle Report Definition
ReCycled Audio Loop Export File
4D Database Windows Client Local File
.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)
.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]
.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)
.RGX ReaGeniX Code Generator Symbol Table
.RH Borland C++ Resource Header 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
.RIP Remote Imaging Protocol
.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
.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
.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
.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
.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
.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
.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
.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)
.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)
.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)
.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
.RTSP Quicktime Real-Time Streaming Protocol File
.RTX Reliacast Audience Manager Turnstile
Mobile Phone Ringtone (extended ringtone format)
.RUI SPEFO Stellar Spectra Analysis File
.RUJ Oracle Recovery-Unit Journal
.RUL InstallShield
.RUN PC Tools Script Tools Program
.RV RealVideo Clip
SPEFO Stellar Spectra Analysis File
.RVB Rhino Script File
.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)
.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
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