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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .R | Open Source | Audio Files | R Script File | R | The R Foundation |
| .R1M | RealNetworks | Audio Files | RealOne Streaming Media File | RealPlayer Cloud | RealNetworks |
| .R3P | Yamaha Corporation | Audio Files | RS7000 | RS7000 Vintage Synth Explorer | Yamaha Corporation |
| .RA | RealNetworks | Audio Files | Real Audio File | VLC Media Player | VideoLAN |
| .RAD | Reality Pump Studios | Audio Files | Reality Adlib Tracker Module | Adlib Tracker II | Adlib Tracker II |
| .RAM | RealNetworks | Audio Files | Real Audio Metadata File | JRiver Media Center | JRiver |
| .RAW | Unknown Developer | Audio Files | Raw Image Data File | MacPhun ColorStrokes | Macphun |
| .RAX | RealNetworks | Audio Files | Real Music Store Audio File | RealPlayer | Realtime Technologies |
| .RBS | Microsoft Corporation | Audio Files | Windows Installer Rollback Script File | Windows Installer | Microsoft Corporation |
| .RCY | Propellerhead | Audio Files | ReCycle 1.x Document | ReCycle | Propellerhead |
| .REL | Nintendo | Audio Files | Relocatable Module File | Stage Switcher | Unknown Developer |
| .REX | Propellerhead | Audio Files | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .RF64 | Radionomy | Audio Files | Winamp RIFF64 Broadcast Wave Format | Nullsoft Winamp | Nullsoft |
| .RFL | Propellerhead | Audio Files | Reason ReFill Sound Bank File | Reason | Propellerhead |
| .RFM | Beatnik | Audio Files | Rich Music Format File | Unknown Software | Unknown Developer |
| .RG | Open Source | Audio Files | Bitmap Picture File | IrfanView | Open Source |
| .RGP | RealNetworks | Audio Files | RealArcade Game Package | RealArcade | RealNetworks |
| .RHL | Edge Sounds, LLC | Audio Files | EdgeSounds RatHole Audio File | RatHole | Edge Sounds, LLC |
| .RIP | IBM | Audio Files | Lotus Notes Error File | IBM Lotus Notes | IBM |
| .RIX | RIX SoftWorks, Inc. | Audio Files | ColoRIX Image File | ColoRIX | RIX SoftWorks, Inc. |
| .RMA | RealNetworks | Audio Files | RealMedia Audio Data | RealPlayer | Realtime Technologies |
| .RMF | Valve | Audio Files | Hammer Rich Map Format | Valve Hammer Editor | Valve |
| .RMI | Open Source | Audio Files | RMID MIDI File | Microsoft Windows Media Player | Microsoft Corporation |
| .RMID | FMJ-Software | Audio Files | RIFF RMID Midi Format | Awave Studio | FMJ-Software |
| .RMJ | RealNetworks | Audio Files | Real Media Jukebox Audio File | NCH Switch | NCH Software |
| .RMM | RealNetworks | Audio Files | RAM Meta File | Media Player Classic | Open Source |
| .RMX | RealNetworks | Audio Files | RealJukebox Format | RealPlayer Cloud | RealNetworks |
| .RNG | Nokia | Audio Files | Nokia Composer Ringtone | Nokia PC Suite | Nokia |
| .RNS | Propellerhead | Audio Files | Reason Song File | Reason | Propellerhead |
| .ROL | Ad Lib, Inc. | Audio Files | Adlib Synthesized Instrument | Nullsoft Winamp | Nullsoft |
| .RPP | Cockos Incorporated | Audio Files | REAPER Project | REAPER | Cockos Incorporated |
| .RRSE | Gryphonclaw Software | Audio Files | REALrunner Lite Sound Effect | REALrunner Lite | Gryphonclaw Software |
| .RSF | EaseUS | Audio Files | Recovery State File | Data Recovery Wizard | EaseUS |
| .RTA | Adobe Systems Incorporated | Audio Files | RoboHelp RTA Data File | Adobe RoboHelp | Adobe Systems Incorporated |
| .RTI | Interscape | Audio Files | Real Tracker Instrument File | Real Tracker | Unknown Developer |
| .RTM | Unknown Developer | Audio Files | Real Tracker Module | Real Tracker | Unknown Developer |
| .RTS | Heaventools Software | Audio Files | Resource Tuner Console Script | Resource Tuner Console | Heaventools Software |
| .RTSP | Apple | Audio Files | Apple QuickTime Real-Time Streaming Protocol File | Apple QuickTime Player | Apple |
| .RVX | RealNetworks | Audio Files | Real Protected Video File | RealPlayer Cloud | RealNetworks |
| .RX2 | Propellerhead | Audio Files | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .RZR | Eugene Roshal | Audio Files | Renamed WinRAR Archive | WinRAR | Eugene Roshal |
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