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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .R00 | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | 7-Zip | Igor Pavlov |
| .R01 | Various Developers | Compressed Files | WinRAR Split Archive Part 1 | 7-Zip | Igor Pavlov |
| .R02 | Eugene Roshal | Compressed Files | WinRAR Split Archive Part 2 | 7-Zip | Igor Pavlov |
| .R03 | Winrar | Compressed Files | WinRAR Split Archive Part 3 | 7-Zip | Igor Pavlov |
| .R04 | Winrar | Compressed Files | WinRAR Split Archive Part 4 | 7-Zip | Igor Pavlov |
| .R06 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R07 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R09 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R30 | Eugene Roshal | Compressed Files | WinRAR Split Archive Part 30 | WinRAR | Eugene Roshal |
| .R36 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R50 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R51 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R52 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R53 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R54 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R55 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R56 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R58 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R59 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R80 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R81 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R83 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R84 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R85 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R86 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R87 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R88 | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .RAR | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | 7-Zip | Igor Pavlov |
| .RAT | World Wide Web Consortium (W3C) | Compressed Files | PICS Rating File | Microsoft Notepad | Microsoft Corporation |
| .REV | Eugene Roshal | Compressed Files | RAR Recovery Volume Set | WinRAR | Eugene Roshal |
| .REZ | Monolith Productions | Compressed Files | Lithtech Game Engine Resource File | Dragon UnPACKer | Open Source |
| .RK | M Software | Compressed Files | WinRK File Archive | WinRK | M Software |
| .RNC | RNC (Rob Northen Computing) | Compressed Files | RNC ProPack Archive File | RNC ProPack | RNC (Rob Northen Computing) |
| .ROA | Gravic, Inc. | Compressed Files | Remark Office OMR Archive | Remark Office OMR | Gravic, Inc. |
| .RP9 | Cloanto Corporation | Compressed Files | RetroPlatform Disk Image Archive | Amiga Forever | Cloanto Corporation |
| .RPM | Red Hat | Compressed Files | Red Hat Package Manager File | Red Hat Package Manager | Open Source |
| .RSS | Various Developers | Compressed Files | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RTE | Autodesk, Inc. | Compressed Files | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RXX | Eugene Roshal | Compressed Files | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .RZ | Andrew Tridgell | Compressed Files | Rzip Compressed Archive | rzip | Andrew Tridgell |
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