| File extension | Developer/Producer | File description |
|---|
| R file extension | Apple | Apple Xcode Core Rez Program Format |
| R*CH file extension | Bare Bones Software | BBEdit |
| R0 file extension | RARLAB | WinRAR Compressed Archive Format |
| R00 file extension | RARLAB | Split Multi-volume RAR Compressed File Archive (part 2) |
| R01 file extension | RARLAB | Split Multi-volume RAR Compressed File Archive (part 3) |
| R02 file extension | RARLAB | Split Multi-volume RAR Compressed File Archive (part 4) |
| R03 file extension | RARLAB | Split Multi-volume RAR Compressed File Archive (part 5) |
| R04 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 6) |
| R05 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 7) |
| R06 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 8) |
| R07 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 9) |
| R08 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 10) |
| R09 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 11) |
| R0F file extension | RingCentral, Inc. | RingCentral Fax Document |
| R1 file extension | RARLAB | WinRAR Multi-Volume Archive Part 1 |
| R10 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 12) |
| R11 file extension | Symantec Corporation | Norton Ghost Rar |
| R12 file extension | Symantec Corporation | Norton Ghost Rar |
| R13 file extension | Symantec Corporation | Norton Ghost Rar |
| R14 file extension | Symantec Corporation | Norton Ghost Rar |
| R15 file extension | Symantec Corporation | Norton Ghost Rar |
| R16 file extension | Symantec Corporation | Norton Ghost Rar |
| R17 file extension | Symantec Corporation | Norton Ghost Rar |
| R18 file extension | Symantec Corporation | Norton Ghost Rar |
| R19 file extension | Symantec Corporation | Norton Ghost Rar |
| R1M file extension | RealNetworks | RealOne Streaming Media Format |
| R1W file extension | Attachmate Corporation | Reflection Setting |
| R2 file extension | RARLAB | WinRAR Multi-Volume Archive Part 2 |
| R20 file extension | Symantec Corporation | Norton Ghost Rar |
| R21 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 23) |
| R22 file extension | Symantec Corporation | Norton Ghost Rar |
| R23 file extension | Symantec Corporation | Norton Ghost Rar |
| R24 file extension | Symantec Corporation | Norton Ghost Rar |
| R25 file extension | Symantec Corporation | Norton Ghost Rar |
| R26 file extension | Symantec Corporation | Norton Ghost Rar |
| R27 file extension | N/A | Norton Ghost Rar |
| R28 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 30) |
| R29 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 31) |
| R2D file extension | RISA Technologies, LLC. | RISA-2D |
| R2K file extension | N/A | Repertoire 2000 Music Database |
| R2W file extension | Attachmate Corporation | Reflection Settings |
| R30 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 32) |
| R31 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 33) |
| R32 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 34) |
| R33 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 35) |
| R34 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 36) |
| R35 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 37) |
| R36 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 38) |
| R37 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 39) |
| R38 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 40) |
| R39 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 41) |
| R3D file extension | RED | REDCODE Multimedia Format |
| R3T file extension | RealNetworks, Inc. | RealNetworks RealText |
| R40 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 42) |
| R41 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 43) |
| R42 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 44) |
| R43 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 45) |
| R44 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 46) |
| R45 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 47) |
| R46 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 48) |
| R47 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 49) |
| R48 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 50) |
| R49 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 51) |
| R50 file extension | Eugene Roshal | Split Multi-volume RAR Compressed File Archive (part 52) |
| R51 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R52 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R53 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R54 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R55 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R56 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R57 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R58 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R59 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R60 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R61 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R62 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R63 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R64 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R65 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R66 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R67 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R68 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R69 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R70 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R71 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R72 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R73 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R74 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R75 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R76 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R77 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R78 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R79 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R8 file extension | Microsoft Studios | Microsoft Flight Simulator Texture |
| R80 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R81 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R82 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R83 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R84 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R85 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R86 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R87 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R88 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R89 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R8? file extension | N/A | Microsoft Word For DOS Font |
| R90 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R91 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R92 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R93 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R94 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R95 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R96 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R97 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| R98 file extension | N/A | RAR Compressed Files From A Multi-volume Archive |
| R99 file extension | Eugene Roshal | RAR Compressed Files From A Multi-volume Archive |
| RA file extension | RealNetworks | RealAudio Audio Format |
| RA2 file extension | N/A | Flare RAW |
| RA3AUTOSAVE file extension | Electronic Arts, Inc. | Command & Conquer Red Alert 3 Save Game |
| RA3CAMPAIGN file extension | Electronic Arts, Inc. | Command & Conquer Red Alert 3 Save Game |
| RA3REPLAY file extension | Electronic Arts, Inc. | Command & Conquer: Red Alert 3 Replay |
| RA3SKIRMISH file extension | Electronic Arts, Inc. | Command & Conquer: Red Alert 3 Skirmish Map |
| RAC file extension | Concept2 Inc. | Venue Race Application |
| RAD file extension | N/A | Radar ViewPoint Radar Data Format |
| RADIUMKEY2 file extension | CatPig Studios | Radium Registration Format |
| RADIUS file extension | N/A | Ruby-Radius Scipt |
| RADQ file extension | RadicalPlay.com | Need For Madness Game Archive |
| RAE file extension | Schlichtherle IT Services | TrueZIP Encrypted ZIP Archive |
| RAES file extension | Schlichtherle IT Services | TrueZIP Encrypted ZIP Archive |
| RAF file extension | Fuji | Fuji CCD-RAW Graphic Format |
| RAG file extension | Bentley Systems, Incorporated | RAM Advanse Generator |
| RAI file extension | Astronomical Institute of the Academy of Sciences of the Czech Republic | SPEFO |
| RAKE file extension | Ruby community | Ruby Makefile |
| RAKEFILE file extension | Ruby community | Ruby Makefile |
| RAL file extension | Span Software | WinRail Track Design Format |
| RAM file extension | RealNetworks | Real Audio Metafile |
| RAMD file extension | Apple, Inc. | Repeat After Me Document |
| RAN file extension | Owen F Ransen | Dexterpen |
| RAP file extension | MAGIX AG | Magix Music Studio Rap |
| RAPC file extension | BlackBerry (Research In Motion Limited) | Java 2 ME Unit |
| RAR file extension | Eugene Roshal | WinRAR RAR Compressed Archive |
| RAR1 file extension | N/A | RAR Archive |
| RAR5 file extension | RARLAB | WinRAR 5 Compressed Archive Format |
| RARENX file extension | Egis Technology Inc. | Egis Encrypted RAR |
| RARX file extension | N/A | Renamed RAR |
| RAS file extension | Sun Microsystems | Sun Raster Bitmap Format |
| RASKINLICENSE file extension | Raskin Software | Raskin For Mac License Format |
| RASKINPLACE file extension | Raskin Software | Raskin Place Settings Format |
| RAST file extension | N/A | Sun Raster Bitmap Image |
| RAT file extension | W3C | PICS Platform For Internet Content Selection Format |
| RATDVD file extension | ACE GmbH | RatDVD Commpressed DVD Movie |
| RAV file extension | Nevrona Designs | Rave Reports Project Format |
| RAW file extension | N/A | Digital Camera Photo RAW Image Format |
| RAX file extension | RealNetworks | RealMedia Streaming Format |
| RAY file extension | Craig Kolb | Rayshade Picture Image Format |
| RA_ file extension | Resco, s.r.o. | Resco Photo Viewer Thumbnail Cache |
| RB file extension | N/A | Ruby Script Format |
| RB0 file extension | Trend Micro Inc. | Trend AntiVirus Backup |
| RB1 file extension | R:BASE Technologies, Inc. | R:Base Data Format |
| RB2 file extension | R:BASE Technologies, Inc. | R:Base Data Format |
| RB3 file extension | R:BASE Technologies, Inc. | R:BASE Data |
| RB4 file extension | Sarm Software | Resume Builder Data Format |
| RBA file extension | Just Great Software Co. Ltd. | RegexBuddy Regular Expression |
| RBB file extension | TAN$TAAFL Software Company | Top Secret Crypto Gold Random Bits Bin |
| RBC file extension | EMC Insignia | Roxio Retrospect Backup Catalogue Format |
| RBDF file extension | N/A | Reading For The Blind And Dyslexic Audio Book With Text |
| RBF file extension | EMC Insignia | Roxio Retrospect Backup Format |
| RBG file extension | Just Great Software Co. Ltd. | RegexBuddy GREP Action |
| RBI file extension | Robert Bentley, Inc. | EBahn Reader |
| RBJ file extension | Marco Pontello | Extra Redcode Kit Compiled Redcode Object Format |
| RBK file extension | Microsoft | Microsoft Windows 95 Registry Backup Format |
| RBL file extension | Just Great Software Co. Ltd. | RegexBuddy Library |
| RBM file extension | Propellerhead Software AB | Propellerhead ReBirth Modulation V2.0 |
| RBO file extension | REAL Software, Inc. | REALbasic Class |
| RBP file extension | REAL | REALbasic Project Format |
| RBS file extension | N/A | Rebirth Song Format |
| RBT file extension | LEGO | Lego MINDSTORMS NXT Program Format |
| RBTX file extension | N/A | NXT Create Pack & Go Package |
| RBVCP file extension | REAL Software | Real Studio Project Format |
| RBW file extension | N/A | Ruby |
| RBX file extension | IBM | IBM Rembo-C Compiled Script Format |
| RBXL file extension | ROBLOX | ROBLOX Game Format |
| RBXM file extension | ROBLOX | ROBLOX Model Format |
| RBXS file extension | ROBLOX | ROBLOX Script |
| RBZ file extension | Trimble | SketchUp Extension |
| RC file extension | N/A | Microsoft Visual Studio Visual C/C++ Resource Script Format |
| RC1 file extension | Samsung | Samsung S5230 Firmware Format |
| RC2 file extension | Microsoft | Microsoft Visual Studio Visual C/C++ Non-compilable Resource Script Format |
| RC3 file extension | Microsoft Corporation | Visual C Resource |
| RCB file extension | RealityRipple.com | Ripple Chat Bot Document |
| RCD file extension | University of Virginia | Arcade Input Format |
| RCF file extension | SonicWALL | SonicWALL VPN Configuration Format |
| RCG file extension | Recog | Recog Character Recognition Set Format |
| RCH file extension | Grassland, Soil & Water Research Laboratory | SWAT Reach Output |
| RCL file extension | Roxio | Easy CD And DVD Creator Project Format |
| RCN file extension | Qstarz International Co, Ltd. | QRacing Track |
| RCO file extension | Sony | Sony PlayStation Portable PSP Resource Format |
| RCP file extension | Pacific Software | Rich Chart Builder Project |
| RCPROJECT file extension | Apple | IMovie Project Format |
| RCS file extension | RandomControl | RandomControl Scene Format |
| RCT file extension | Microsoft | Microsoft Visual Studio Resource Template Format |
| RCU file extension | RealWorld Graphics | RealWorld Layered Cursor Image |
| RCV file extension | QUALCOMM Incorporated | Eudora Temporary Download |
| RCX file extension | RED | REDCINE-X Project Format |
| RCY file extension | Propellerhead Software | ReCycle Audio Loop Format |
| RD file extension | N/A | R Document |
| RD2 file extension | Codemasters | TOCA Race Driver 2 Saved Game |
| RD3 file extension | Corel Corporation | CorelDRAW CorelDream 3D |
| RD3F file extension | Corel Corporation | CorelDRAW CorelDream 3D |
| RD5 file extension | Autodesk, Inc. | Autodesk Road Aligment |
| RDA file extension | The R Project for Statistical Computing | Oracle Storage Area Format |
| RDAT file extension | N/A | RNA Data (RDAT) |
| RDATA file extension | The R Project for Statistical Computing | R Workspace Format |
| RDB file extension | N/A | N64 Nintendo 64 ROM Database Format |
| RDC file extension | Clark Labs | IDRISI Raster Documentation Format |
| RDD file extension | ReliaSoft Corporation | ALTA |
| RDE file extension | Mindware Studios, s.r.o. | Painkiller Overdose Game |
| RDF file extension |
