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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .RCG | Neil Fraser | Web Files | Recog Character Recognition Set | Recog | Neil Fraser |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | MacroMates TextMate | MacroMates |
| .RJS | Yukihiro “Matz” Matsumoto | Web Files | Ruby Javascript File | Notepad++ | Don Ho |
| .RSS | Various Developers | Web Files | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RT | RealNetworks | Web Files | RealText Streaming Text File | VLC Media Player | VideoLAN |
| .RW3 | Realmac Software | Web Files | RapidWeaver 3 Site File | RapidWeaver | Realmac Software |
| .RWP | Realmac Software | Web Files | RapidWeaver Package | RapidWeaver | Realmac Software |
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