| .r | R Script Format |
| .r*ch | BBEdit |
| .r0 | WinRAR Compressed Archive Format |
| .r00 | WinRAR Compressed Archive Format |
| .r01 | Split Multi-volume RAR Compressed File Archive (part 3) |
| .r02 | Split Multi-volume RAR Compressed File Archive (part 4) |
| .r03 | Split Multi-volume RAR Compressed File Archive (part 5) |
| .r04 | Split Multi-volume RAR Compressed File Archive (part 6) |
| .r05 | Split Multi-volume RAR Compressed File Archive (part 7) |
| .r06 | Split Multi-volume RAR Compressed File Archive (part 8) |
| .r07 | Split Multi-volume RAR Compressed File Archive (part 9) |
| .r08 | Split Multi-volume RAR Compressed File Archive (part 10) |
| .r09 | Split Multi-volume RAR Compressed File Archive (part 11) |
| .r0f | RingCentral Fax Document |
| .r1 | WinRAR Multi-Volume Archive Part 1 |
| .r10 | Split Multi-volume RAR Compressed File Archive (part 12) |
| .r11 | Split Multi-volume RAR Compressed File Archive (part 13) |
| .r12 | Norton Ghost Rar |
| .r13 | Norton Ghost Rar |
| .r14 | Norton Ghost Rar |
| .r15 | Norton Ghost Rar |
| .r16 | Norton Ghost Rar |
| .r17 | Norton Ghost Rar |
| .r18 | Norton Ghost Rar |
| .r19 | Norton Ghost Rar |
| .r1m | RealOne Streaming Media Format |
| .r1w | Reflection Setting |
| .r2 | WinRAR Multi-Volume Archive Part 2 |
| .r20 | Norton Ghost Rar |
| .r21 | Split Multi-volume RAR Compressed File Archive (part 23) |
| .r22 | Norton Ghost Rar |
| .r23 | Norton Ghost Rar |
| .r24 | Norton Ghost Rar |
| .r25 | Norton Ghost Rar |
| .r26 | Norton Ghost Rar |
| .r27 | Norton Ghost Rar |
| .r28 | Split Multi-volume RAR Compressed File Archive (part 30) |
| .r29 | Split Multi-volume RAR Compressed File Archive (part 31) |
| .r2d | RISA-2D |
| .r2k | Repertoire 2000 Music Database |
| .r2w | Reflection Settings |
| .r30 | Split Multi-volume RAR Compressed File Archive (part 32) |
| .r31 | Split Multi-volume RAR Compressed File Archive (part 33) |
| .r32 | Split Multi-volume RAR Compressed File Archive (part 34) |
| .r33 | Split Multi-volume RAR Compressed File Archive (part 35) |
| .r34 | Split Multi-volume RAR Compressed File Archive (part 36) |
| .r35 | Split Multi-volume RAR Compressed File Archive (part 37) |
| .r36 | Split Multi-volume RAR Compressed File Archive (part 38) |
| .r37 | Split Multi-volume RAR Compressed File Archive (part 39) |
| .r38 | Split Multi-volume RAR Compressed File Archive (part 40) |
| .r39 | Split Multi-volume RAR Compressed File Archive (part 41) |
| .r3d | REDCODE Multimedia Format |
| .r3t | RealNetworks RealText |
| .r40 | Split Multi-volume RAR Compressed File Archive (part 42) |
| .r41 | Split Multi-volume RAR Compressed File Archive (part 43) |
| .r42 | Split Multi-volume RAR Compressed File Archive (part 44) |
| .r43 | Split Multi-volume RAR Compressed File Archive (part 45) |
| .r44 | Split Multi-volume RAR Compressed File Archive (part 46) |
| .r45 | Split Multi-volume RAR Compressed File Archive (part 47) |
| .r46 | Split Multi-volume RAR Compressed File Archive (part 48) |
| .r47 | Split Multi-volume RAR Compressed File Archive (part 49) |
| .r48 | Split Multi-volume RAR Compressed File Archive (part 50) |
| .r49 | Split Multi-volume RAR Compressed File Archive (part 51) |
| .r50 | Split Multi-volume RAR Compressed File Archive (part 52) |
| .r51 | RAR Compressed Files From A Multi-volume Archive |
| .r52 | RAR Compressed Files From A Multi-volume Archive |
| .r53 | RAR Compressed Files From A Multi-volume Archive |
| .r54 | RAR Compressed Files From A Multi-volume Archive |
| .r55 | RAR Compressed Files From A Multi-volume Archive |
| .r56 | RAR Compressed Files From A Multi-volume Archive |
| .r57 | RAR Compressed Files From A Multi-volume Archive |
| .r58 | RAR Compressed Files From A Multi-volume Archive |
| .r59 | RAR Compressed Files From A Multi-volume Archive |
| .r60 | RAR Compressed Files From A Multi-volume Archive |
| .r61 | RAR Compressed Files From A Multi-volume Archive |
| .r62 | RAR Compressed Files From A Multi-volume Archive |
| .r63 | RAR Compressed Files From A Multi-volume Archive |
| .r64 | RAR Compressed Files From A Multi-volume Archive |
| .r65 | RAR Compressed Files From A Multi-volume Archive |
| .r66 | RAR Compressed Files From A Multi-volume Archive |
| .r67 | RAR Compressed Files From A Multi-volume Archive |
| .r68 | RAR Compressed Files From A Multi-volume Archive |
| .r69 | RAR Compressed Files From A Multi-volume Archive |
| .r70 | RAR Compressed Files From A Multi-volume Archive |
| .r71 | RAR Compressed Files From A Multi-volume Archive |
| .r72 | RAR Compressed Files From A Multi-volume Archive |
| .r73 | RAR Compressed Files From A Multi-volume Archive |
| .r74 | RAR Compressed Files From A Multi-volume Archive |
| .r75 | RAR Compressed Files From A Multi-volume Archive |
| .r76 | RAR Compressed Files From A Multi-volume Archive |
| .r77 | RAR Compressed Files From A Multi-volume Archive |
| .r78 | RAR Compressed Files From A Multi-volume Archive |
| .r79 | RAR Compressed Files From A Multi-volume Archive |
| .r8 | Microsoft Flight Simulator Texture |
| .r80 | RAR Compressed Files From A Multi-volume Archive |
| .r81 | RAR Compressed Files From A Multi-volume Archive |
| .r82 | RAR Compressed Files From A Multi-volume Archive |
| .r83 | RAR Compressed Files From A Multi-volume Archive |
| .r84 | RAR Compressed Files From A Multi-volume Archive |
| .r85 | RAR Compressed Files From A Multi-volume Archive |
| .r86 | RAR Compressed Files From A Multi-volume Archive |
| .r87 | RAR Compressed Files From A Multi-volume Archive |
| .r88 | RAR Compressed Files From A Multi-volume Archive |
| .r89 | RAR Compressed Files From A Multi-volume Archive |
| .r8? | Microsoft Word For DOS Font |
| .r90 | RAR Compressed Files From A Multi-volume Archive |
| .r91 | RAR Compressed Files From A Multi-volume Archive |
| .r92 | RAR Compressed Files From A Multi-volume Archive |
| .r93 | RAR Compressed Files From A Multi-volume Archive |
| .r94 | RAR Compressed Files From A Multi-volume Archive |
| .r95 | RAR Compressed Files From A Multi-volume Archive |
| .r96 | RAR Compressed Files From A Multi-volume Archive |
| .r97 | RAR Compressed Files From A Multi-volume Archive |
| .r98 | RAR Compressed Files From A Multi-volume Archive |
| .r99 | RAR Compressed Files From A Multi-volume Archive |
| .ra | RealAudio Audio Format |
| .ra2 | Flare RAW |
| .RA3Autosave | Command & Conquer Red Alert 3 Save Game |
| .RA3Campaign | Command & Conquer Red Alert 3 Save Game |
| .ra3replay | Command & Conquer: Red Alert 3 Replay |
| .ra3skirmish | Command & Conquer: Red Alert 3 Skirmish Map |
| .rac | Venue Race Application |
| .rad | Reality AdLib Tracker 2 Format |
| .radiumkey2 | Radium Registration Format |
| .radius | Ruby-Radius Scipt |
| .radq | Need For Madness Game Archive |
| .rae | TrueZIP Encrypted ZIP Archive |
| .raes | TrueZIP Encrypted ZIP Archive |
| .raf | Fuji CCD-RAW Graphic Format |
| .rag | RAM Advanse Generator |
| .rai | SPEFO |
| .rake | Ruby Makefile |
| .rakefile | Ruby Makefile |
| .ral | WinRail Track Design Format |
| .ram | Real Audio Metafile |
| .ramd | Repeat After Me Document |
| .ran | Dexterpen |
| .rap | Magix Music Studio Rap |
| .rapc | Java 2 ME Unit |
| .rar | WinRAR Compressed Archive Format |
| .rar1 | RAR Archive |
| .rar5 | WinRAR Compressed Archive Format |
| .rarenx | Egis Encrypted RAR |
| .rarx | Renamed RAR |
| .ras | Sun Raster Bitmap Format |
| .raskinlicense | Raskin For Mac License Format |
| .raskinplace | Raskin Place Settings Format |
| .rast | Sun Raster Bitmap Image |
| .rat | PICS Platform For Internet Content Selection Format |
| .ratdvd | RatDVD Commpressed DVD Movie |
| .rav | FIFA 2001 Data Environment Format |
| .raw | Digital Camera Photo RAW Image Format |
| .rax | RealMedia Streaming Format |
| .ray | Rayshade Picture Image Format |
| .ra_ | Resco Photo Viewer Thumbnail Cache |
| .rb | Ruby Script Format |
| .rb0 | Trend AntiVirus Backup |
| .rb1 | R:Base Data Format |
| .rb2 | R:Base Data Format |
| .rb3 | R:BASE Data |
| .rb4 | Trend AntiVirus Backup Format |
| .rba | RegexBuddy Regular Expression |
| .rbb | Top Secret Crypto Gold Random Bits Bin |
| .rbc | Easy Resume Creator Pro Resume Format |
| .rbdf | Reading For The Blind And Dyslexic Audio Book With Text |
| .rbf | Microsoft Windows Rollback Script Format |
| .rbg | RegexBuddy GREP Action |
| .rbi | EBahn Reader |
| .rbj | Extra Redcode Kit Compiled Redcode Object Format |
| .rbk | Microsoft Windows 95 Registry Backup Format |
| .rbl | RegexBuddy Library |
| .rbm | Propellerhead ReBirth Modulation V2.0 |
| .rbo | REALbasic Class |
| .rbp | REALbasic Project Format |
| .rbs | Rebirth Song Format |
| .rbt | Lego MINDSTORMS NXT Program Format |
| .rbtx | NXT Create Pack & Go Package |
| .rbvcp | Real Studio Project Format |
| .rbw | Ruby |
| .rbx | IBM Rembo-C Compiled Script Format |
| .rbxl | ROBLOX Game Format |
| .rbxm | ROBLOX Model Format |
| .rbxs | ROBLOX Script |
| .rbz | Rail Baron Player Saved Game Format |
| .rc | Microsoft Visual Studio Visual C/C++ Resource Script Format |
| .rc1 | Samsung S5230 Firmware Format |
| .rc2 | Microsoft Visual Studio Visual C/C++ Non-compilable Resource Script Format |
| .rc3 | Visual C Resource |
| .rcb | Ripple Chat Bot Document |
| .rcd | PcAnywhere Recorded Session Format |
| .rcf | Prototype Game Format |
| .rcg | Netscape Newsgroup Format |
| .rch | SWAT Reach Output |
| .rcl | Easy CD And DVD Creator Project Format |
| .rcn | QRacing Track |
| .rco | Sony PlayStation Portable PSP Resource Format |
| .rcp | Rich Chart Builder Project |
| .rcproject | Apple IMovie Project Format |
| .rcs | RandomControl Scene Format |
| .rct | Microsoft Visual Studio Resource Template Format |
| .rcu | RealWorld Layered Cursor Image |
| .rcv | Eudora Temporary Download |
| .rcx | REDCINE-X Project Format |
| .rcy | ReCycle Audio Loop Format |
| .rd | R Document |
| .rd2 | TOCA Race Driver 2 Saved Game |
| .rd3 | CorelDRAW CorelDream 3D |
| .rd3f | CorelDRAW CorelDream 3D |
| .rd5 | Autodesk Road Aligment |
| .rda | Oracle Storage Area Format |
| .rdat | RNA Data (RDAT) |
| .rdata | R Workspace Format |
| .rdb | N64 Nintendo 64 ROM Database Format |
| .rdc | IDRISI Raster Documentation Format |
| .rdd | ALTA |
| .rde | Painkiller Overdose Game |
| .rdf | Resource Description Framework RSS Feed Format |
| .rdg | Morae Recorded Video |
| .rdi | Device Independent Bitmap Format |
| .rdl | Corel Paradox Format |
| .rdlc | Microsoft Visual Studio Report Definition Format |
| .rdlx | Microsoft Power View Project Format |
| .rdm | Ragdoll Masters Preference |
| .rdo | Xerox Rawster Document Object Format |
| .rdoc | RubyDoc Script |
| .rdp | Microsoft Windows Remote Desktop Connection Settings Format |
| .rds | Ray Dream 3D Animation Format |
| .rdt | Adobe Captivate RoboDemo Template |
| .rdv | NTgraph |
| .rdw | Real-DRAW Project |
| .rdx | Borland Reflex Database Format |
| .rdy | INet-Server |
| .rdz | Mandrake Linux Install |
| .re | Python Regular Expressions Source Code |
| .re2 | NEK5000 Mesh |
| .re4 | Resident Evil 4 |
| .rea | Readme Text |
| .readme | Visual FoxPro Documenting Wizard List |
| .real | Gnome Desktop |
| .reapeaks | REAPER Scratch |
| .reb | REBOL Script Format |
| .rec | Recorded Format |
| .reco | Evernote |
| .record | Recorded Audio Format |
| .red | CADViewer Redline Markup Format |
| .redir | Spotify Redirect Format |
| .ref | Reference Format |
| .reference | Budget In Brief Application Reference Format |
| .refi | E-Sword Reference IOS Notes |
| .refresh | Microsoft Visual Studio Refresh Format |
| .refx | E-Sword Reference Library Note |
| .reg | Windows Registry Data Format |
| .regi | Kagi Registration Module |
| .regs | Netscape Registry |
| .regtrans-ms | Microsoft Windows Vista And Windows 7 Registry Format |
| .regularizer | SAM Transition Regularizer |
| .rej | Mercurial Reject |
| .rel | Norton Internet Security 2001 Log Format |
| .reloc | Microsoft Windows EXE Relocation Format |
| .rels | Microsoft Open Office XML Relationships Format |
| .rem | BlackBerry Encrypted Data Format |
| .renderman | Pixar RenderMan 3.1 Specification |
| .rep | BusinessObjects Report Format |
| .repatch | Reason DCAM EnvShaper Effect Preset |
| .repx | XtraReports Report Definition |
| .req | SSL Certificate Request Format |
| .res | Microsoft C, C++ Compiled Resource Format |
| .resdex | Stronghold 3 Resource |
| .resjson | Microsoft Windows 8 Metro JavaScript Format |
| .resmoncfg | Microsoft Windows Resource Monitor Settings Format |
| .resourceconfig | Visual Studio Resource Configuration |
| .resources | Microsoft Visual Studio Resource Format |
| .resp | Microsoft Windows Report Log |
| .rest | ReStructuredText |
| .resw | Microsoft Windows 8 Resources Format |
| .resx | Microsoft Visual Studio .NET XML Resource Template Format |
| .ret | RETScreen Project Format |
| .rev | WinRAR Recovery Volume Format |
| .rew | MRMC Markov Reward Model Checker Definition |
| .rewi | MRMC Markov Reward Model Checker Definition |
| .rex | ReCycle Audio Loop Export Format |
| .rez | LithTech Game Engine Resource Format |
| .rf | Sun Bitmap Image |
| .rf0 | SmartWare Runtime Project |
| .rf1 | Retirement Forecast Format |
| .rf2 | SmartWare Runtime Project |
| .rf3 | SmartWare Runtime Project |
| .rf4 | SmartWare Runtime Project |
| .rf5 | Tektronix |
| .rfa | Autodesk Revit Architecture Family Format |
| .rfb | RoboForm Bookmarks Format |
| .rfc | RoboForm Contact Format |
| .rfd | RecogniFORM Form Definition Format |
| .rfe | RockFlow Log |
| .rfg | RFG Integrator System Database |
| .rfgs_pc | Red Faction: Guerilla Saved Game Format |
| .rfh | RFG Integrator Householding Database |
| .rfi | SPEFO Stellar Spectra Analysis |
| .rfl | ANSYS Format |
| .rfm | RFactor Modification Format |
| .rfmod | RFactor 2 Mod |
| .rfn | RoboForm SafeNote Files |
| .rfo | RoboForm License And Options Format |
| .rfp | RoboForm Passcard Format |
| .rfq | RoboForm SearchCard Format |
| .rfr | Adobe Photoshop Frame Filter |
| .rfs | RealFlow Script |
| .rft | Revit Template Format |
| .rfv | Restricted Focus Viewer Input |
| .rfw | Rockchip Firmware Format |
| .rfx | RoboForm Blocked Passcard |
| .rg | Rosegarden Music |
| .rgb | SGI RGB Bitmap Format |
| .rgba | Silicon Graphics Image File Format |
| .rgbe | Radiance Map |
| .rgd | Rosegarden Device Definition |
| .rgdb | Adobe Registration Database |
| .rge | Microsoft Outlook For Mac Archive Format, Entourage Personal Folder Format |
| .rgf | Advanced Registry Tracer Scan Data |
| .rgh | ZZ RouGH Image |
| .rgi | RealArcade Game Installer |
| .rgm | Essence Game Engine Model |
| .rgmb | RootsMagic Backup Format |
| .rgmc | RootsMagic Genealogy Project Format |
| .rgn | Garmin Region Format |
| .rgo | RepliGo Virtual Print Format |
| .rgp | RealArcade Game Package |
| .rgrp | Pro Tools Region Group Format |
| .rgs | InstallShield Script For Windows Registry |
| .rgss2a | RPG Maker VX RGSS Encrypted Archive Format |
| .rgss3a | RPG Maker VX RGSS Version 3 Encrypted Archive |
| .rgssad | RPG Maker VX RGSS Encrypted Archive |
| .rgu | Microsoft Windows Mobile Registry Entry |
| .rguninst | RealArcade Uninstall Script |
| .rgz | Ragnarok EXE And BGM Patch Archive |
| .rh | C++ Resource Header |
| .rha | Adobe RoboHelp AIR Help Project |
| .rhistory | R History Format |
| .rhk | Backdoor.Win32.Rbot.rhk Trojan Virus |
| .rhl | EdgeSounds RatHole Compressed Audio |
| .rhm | Right Hemisphere Material |
| .rhp | Encore Format Format Format |
| .rhtml | Ruby HTML Web Page Format |
| .ri | Lotus 1-2-3 Data |
| .ribbons | Ribbons |
| .ric | Lego NXT Image Format |
| .rid | GerbMagic Raster Image |
| .rif | Corel Painter Raster Image Format |
| .riff | Painter Raster Image |
| .rig | LightWave 3D RIG Function Format |
| .rik | SharpMap |
| .rim | BioWare Resource Image Format |
| .rio | IBM AIX System |
| .rip | Lotus Notes Error |
| .ripxr | RipXR Compressed Archive |
| .ris | Research Information Systems Citation Format |
| .riscos | Acorn RISC OS |
| .rise | RISE Information Model Format |
| .riv | CRiSP Harvest |
| .rix | ColoRix Bitmap Image |
| .rjs | RealJukebox Skin |
| .rjt | RealPlayer Track Info Style |
| .rk | WinRK Archive Format |
| .rkc | Mario Kart Wii Competition Data |
| .rkg | Mario Kart Wii Ghost Data |
| .rkp | Rockchip MP4 Player Game |
| .rkr | Rakarrack |
| .rkt | Racket Information Module |
| .rkv | Star Wars The Clone Wars Republic Heroes Game Archive |
| .rkw | RockWorks Graphics |
| .rl | R.viewer Format |
| .rl1 | Descent 1 Registered Level |
| .rl2 | Descent 2 Registered Level |
| .rl4 | Device-independent Bitmap |
| .rla | Alias/Wavefront Bitmap Image |
| .rlb | Alias/Wavefront Bitmap Image |
| .rlc | ArcView Image |
| .rld | Norton Commander Temporary |
| .rle | Run Length Encoded Bitmap |
| .rle.gz | Golly Compressed Pattern Format |
| .rlf | ArcGIS Report Layout Format |
| .rlg | Weibull++ |
| .rli | RealWorld Graphics Layered Image |
| .rll | Resource Hacker Resource Library Format |
| .rln | Alpha Four Database |
| .rlog | MPICH Log |
| .rls | RadLight Skin Format |
| .rlst | Sims 3 Data |
| .rlt | ReliaSoft BlockSim & Weibull++ |
| .rlw | Ricochet Lost Worlds: Recharged |
| .rlx | XMetaL Compiled Form |
| .rm | RealMedia Format |
| .rm3d | RiskMetrics RiskManager |
| .rma | RealMedia Audio |
| .rman | Oracle Datafile Backup |
| .rmap | CompeGPS Land Raster Map |
| .rmb | SafeGuard RemovableMedia Keyring Backup |
| .rmbak | Registry Mechanic Backup Format |
| .rmc | RMCalc |
| .rmd | Microsoft RegMaid Document Format |
| .rmdp | Alan Wake Game Data |
| .rme | Final Fantasy Audio |
| .rmf | Adobe Acrobat Rights Management Document Format |
| .rmg | Rimage Image |
| .rmgc | RootsMagic Genealogy Database |
| .rmi | MIDI-sequention Music (RIFF RMID Format) |
| .rmid | RIFF RMID Midi Format |
| .rmj | RealAudio Media Format |
| .rmk | CA Clipper RMake Makefile |
| .rml | Redline Markup Language Format |
| .rmm | RAM Meta Format |
| .rmn | Oracle Recovery Manager Script |
| .rmp | RealAudio Audio Format |
| .rmr | ResumeMaker Format |
| .rms | RealMedia Secure Media File Format |
| .rmskin | Rainmeter Skin Format |
| .rmt | Linksys Router Firmware Format |
| .rmuf | Alpha Five Runtime Format |
| .rmv | The Simpsons Hit & Run Video Format |
| .rmvb | RealMedia Variable Bitrate Format |
| .rmw | RAM Commander Database |
| .rmx | RealMedia Secure Media Clip |
| .rna | Malware |
| .rnc | RNC ProPack Archive Format |
| .rnd | AutoCAD Autoshade Rendering Slide Format |
| .rng | Random Number Generator Data Format |
| .rnk | Dial-up Shortcut |
| .rnl | GTX Runlength Encoded Bitmap Graphics |
| .rnq | Renque Model Format |
| .rnr | The 11th Hour Game Data |
| .rns | Reason Audio Format |
| .rnt | EdgeCAM Licensing Data |
| .rnw | Sweave Source |
| .rnx | RealPlayer Audio Or Settings Format |
| .ro | ROwin Project |
| .roacj | Call Of Juarez Game Resource Data |
| .rob | Wintask Compiled Program |
| .robo | RoboMind Source Code |
| .roc | SpaceCAD Rocket Design |
| .roca | RIB Office Compressed Archive Format |
| .rock | Rockbox Installation Format |
| .rockwell | Rockwell (modem) |
| .rockwell-2 | Rockwell 2-bit ADPCM Data |
| .rockwell-3 | Rockwell 3-bit ADPCM Data |
| .rockwell-4 | Rockwell 4-bit ADPCM Data |
| .rod | Actuate E.Report Designer Report Object Design |
| .rodl | RemObjects Definition Language Format |
| .roff | Unformatted Manual Page (Roff/nroff/troff/groff) |
| .rofl | Leagues Of Legends Replay |
| .rog | Roger 2 Data Format |
| .roh | Avantes |
| .roi | Report Object Instance |
| .rol | AdLib Visual Composer Music Data Format |
| .rom | Read Only Memory Image (emulators/AONs) |
| .roo | WinRAR Archive |
| .roq | Id Software Game Video |
| .ros | Dynamite VSP Rail Object Style Format |
| .rot | Homeworld 2 Game Graphics Data Format |
| .rotest | RemObjects SDK Test Format |
| .rotestresult | RemObjects SDK Test Results Format |
| .rou | Gerber Route Format |
| .rov | Actuate E.Report Designer Report Object Value |
| .row | Actuate E.Report HTML Report Document |
| .rox | Actuate E.Report Designer Report Object Executable Format |
| .roxio | Roxio Creator Project Format |
| .roz | ASc TimeTables Timetable |
| .rp | Axure RP Project Format |
| .rp2 | RetroPlatform Player (Amiga Forever) Format |
| .rp3 | Need For Speed Game |
| .rp9 | RetroPlatform Format |
| .rpa | RIB ITWO Project Archive Format |
| .rpack | Call Of Juarez Game Data |
| .rpb | Radmin Phonebook Format |
| .rpbm | Portable Bitmap Image |
| .rpc | Visual Basic Crystal Reports |
| .rpd | Roleplay Designer Data Format |
| .rpe | Performance Analyzer |
| .rpf | 3ds Max Rich Pixel Format |
| .rpg | The RPG Programming Language |
| .rpgm | Portable Greyscale Image |
| .rpi | Render Extension |
| .rpj | RealPlayer JavaScript Format |
| .rpk | NeverForget Backup Reminder Format |
| .rpl | Toribash Replay Game Format |
| .rplib | Axure Widget Library Format |
| .rpln | Adobe InDesign Required Function Library |
| .rpm | Linux Package Manager Format |
| .rpmsg | Microsoft Restricted Permission Message Format |
| .rpn | ACT! 2.0 Report |
| .rpnm | Portable Image Image |
| .rpo | IBM XL C/C++ For Linux Compiler |
| .rpp | REAPER Project Format |
| .rppm | Portable Image Image Format |
| .rpprj | Axure RP Shared Project Format |
| .rpr | IBM Voice Type Languages Vocabels |
| .rprofile | Quick-R R Programming Language Configuration |
| .rps | 3D Studio Max Render Preset Settings Format |
| .rpt | Report Format |
| .rpt2 | ESignal Report |
| .rptproj | Microsoft Visual Studio 2008 Report Project |
| .rptr | RafflePrinter Document Format |
| .rptx | Spiceworks Report |
| .rpv | RealPlayer Visualization |
| .rpw | RPWiz Project |
| .rpx | Repute Tutorial |
| .rpy | Python Script Format |
| .rpym | RenPy Module |
| .rpz | Crystal Reports ZIP Compressed And Encrypted Report |
| .rqc | Micro Focus Revolve |
| .rqi | TrueNet R-Quest Disc Image |
| .rqm | IBM RequisitePro Metrics Report |
| .rqt | Report Quality Plotting Module |
| .rqy | Microsoft Excel OLE DB Query |
| .rra | Windows Installer Temporary Format Format |
| .rrc | BlackBerry Java Resource Content |
| .rrd | Reduced Resolution Dataset Format |
| .rrd4j | RRD4J Graph |
| .rrf | Raytech |
| .rrg | JRiver Media Center License |
| .rrh | BlackBerry Resource Header |
| .rri | RealWorld Icon Editor Picture Image Format |
| .rrpa | Oracle Reports Remote Printing Utility PDF Report |
| .rrr | Registry Mechanic Backup Format |
| .rrt | Rhapzode Resource Template Format |
| .rrx | IBM Datacap Define |
| .rs | Sun Raster Bitmap Image Format |
| .rs1 | RETScreen Spreadsheet |
| .rs2 | RailSim2 Layout Format |
| .rs7 | LightTools Radiant Source Model |
| .rs8 | ProSource |
| .rsa | RSA Digital Certificate Format |
| .rsb | Red Storm Bitmap Format |
| .rsc | Resource Format |
| .rsd | Database Format |
| .rsd-journal | REALSQLDatabase Journal |
| .rsdb | Resort Software Database |
| .rsdf | RapidShare Download Settings Format |
| .rsds | SharePoint Shared Data Source |
| .rsed | ResEdit |
| .rsf | Mediafour MacDrive Macintosh Resource Fork |
| .rsfx | Reflection |
| .rsg | Drakan Order Of The Flame |
| .rsh | Warhammer 40,000 Texture |
| .rsi | Reactis |
| .rsl | Robot Scripting Language |
| .rsm | ReliaSoft MPC 3 Format |
| .rsml | RealPlayer ML |
| .rsn | Propellerhead Reason Audio Format |
| .rso | LEGO NXT Brick Audio Format |
| .rsp | Linker Response Format |
| .rsq | IBM 4690 Operating System |
| .rsr | Poser Model Preview Format |
| .rsrc | MAC OS Resource Format |
| .rsrs | Buddy API |
| .rss | Really Simple Syndication - RSS File Format |
| .rst | ReStructuredText Format |
| .rsu | Reflection For IBM Updated Settings |
| .rsv | RSView32 Project Format |
| .rsw | R&R SQL Report Writer Report Format |
| .rsx | RED Metadata XML Format |
| .rsym | ArchiCAD For MAC Geometric Description Language |
| .rs_ | Macintosh Resource Fork |
| .rt | RealText Subtitle Format |
| .rt2 | OziExplorerCE Route |
| .rta | IBM Voice Type Languages Vocabulary Format |
| .rtab | Randy Tab Guitar Tablature |
| .rtb | Rhino 3D Toolbar Collection |
| .rtc | AutoCAD Civil Rating Curve Data Format |
| .rtd | Retina Network Security Scanner Output Format |
| .rte | OziExplorer Route Format |
| .rtf | Rich Text Format Document |
| .rtfd | Rich Text With Graphic Document Format |
| .rtg | Autodesk Maya 3D Scene Data |
| .rth | ANSYS Results |
| .rti | Real Tracker Instrument Format |
| .rtk | Adobe RoboHelp Configuration |
| .rtkt | Royaltek Binary Data |
| .rtl | Text |
| .rtm | Real Tracker Music Module (MOD) Format |
| .rtmap | CompeGPS Land Raster Map |
| .rtn | MeasureMind 3D |
| .rtp | Microsoft Software Update Format |
| .rtpi | 3rdTech Scanner |
| .rtr | Astrotite 200X Offline Data Repair |
| .rts | Resource Tuner Console Script Format |
| .rtsl | RealAudio RTSL Document |
| .rtsp | Apple QuickTime Real-time Streaming Protocol |
| .rtstn | Audials Station Format |
| .rtsx | Royal TS Document Settings |
| .rtt | Ragtime |
| .rtttl | RTTTL / Nokring Mobile Ring-tone Format |
| .rtu | RivaTuner Update |
| .rtw | Real-Time Workshop Database |
| .rtwsh | Radiotracker Wishlist Format |
| .rtx | Mobile Phone Ringtone |
| .rt_ | Microsoft Windows Winhelp Compressed |
| .ru | Russian Text Or Localization Format |
| .rub | JQuery Rules |
| .ruf | ProWORX Tables Reference Format |
| .ruj | Oracle Recovery-Unit Journal |
| .rul | Rule Format |
| .rule | Visual C++ Project Rules |
| .ruleset | Microsoft Visual Studio Code Analysis Ruleset Format |
| .rum | Bink Video Subtitle Format |
| .run | Linux Executable Format |
| .rup | IBM Rational Unified Process |
| .rus | Navitel Navigator Map |
| .rv | RealVideo Video Format |
| .rv3 | Newsbin Pro |
| .rv9 | RealVideo Movie |
| .rvb | Rhinoceros 3D Visual Basic Script |
| .rvc | TNTmips Windows Version Project |
| .rvd | VPHybridCAD Native Drawing Format |
| .rvdata | RPG Maker Data Format |
| .rvdata2 | RPG Maker VX Data |
| .rvf | RichView Document |
| .rvg | Revit External Group |
| .rvi | Revenant Game Archive |
| .rvid | Snapz Pro X Video Format |
| .rvl | Muvee Project |
| .rvm | Revenant Game Archive |
| .rvmat | Armed Assault Texture |
| .rvp | Microsoft Scan Configuration |
| .rvproj | RPG Maker VX Project Format |
| .rvproj2 | RPG Maker VX Project |
| .rvr | Revenant Game Archive |
| .rvs | Revenant Game Archive |
| .rvt | Autodesk Revit Architecture Project Format |
| .rvw | ReviewMate Review |
| .rvx | Real Protected Video Format |
| .rw | Navicat For MySQL |
| .rw2 | Panasonic Lumix RAW Image Format |
| .rw3 | RapidWeaver Site Design Format |
| .rw5 | Survey Pro Data |
| .rwa | Weibull++ |
| .rwc | WAsP Regional Wind Climate |
| .rwd | RWD Compressed Game Archive |
| .rwg | Random Word Generator File Format |
| .rwk | Bentley InRoads Project |
| .rwl | D-Lux 4 RAW Image Format |
| .rwlibrary | Paperless Receipt Library Format |
| .rwm | Windows Imaging Resource Only |
| .rwo | Matlab Output |
| .rwp | RapidWeaver Web Package Format |
| .rwplugin | RapidWeaver Plugin Format |
| .rwr | RiffWorks IntelliRiffer |
| .rws | Borland C++ Resource Workshop Symbol Format |
| .rwsnippet | RapidWeaver Snippet Format |
| .rwstyle | RapidWeaver Style Format |
| .rwsw | RapidWeaver Website Saved Project |
| .rwtheme | RapidWeaver Theme Format |
| .rwtl | HyperRESEARCH |
| .rwx | Netscape Live 3D |
| .rwz | Microsoft Outlook Internet Rules Settings Format |
| .rx | MS-DOS 7 |
| .rx2 | ReCycle! Audio Loop Format |
| .rx3 | FIFA 11 Texture |
| .rxc | Roxio Certificate Format |
| .rxd | Attachmate Reflection X Manager Definition |
| .rxdata | RPG Maker RMXP Data Format |
| .rxe | Lego Mindstorms NXT Executable Format |
| .rxl | Seetrax Ranger CAD Drawing |
| .rxm | Reflection X Multi Session |
| .rxml | Roxen Macro Language |
| .rxp | Easy CD & DVD Creator 6 Playlist |
| .rxproj | RPG Maker Project |
| .rxs | RSIGuard RSIScript |
| .rxx | RAR Compressed Files From A Multi-volume Archive |
| .rz | Rzip Compressed Archive |
| .rzb | Red Zion E-book Book Format |
| .rzk | File Crypt Password Format |
| .rzn | Red Zion E-book Notes Format |
| .rzr | Renamed WinRAR Archive |
| .rzs | Red Zion Security Format |
| .rzx | File Crypt Encrypted Format |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
