| Extension | 描述 | 檔案格式 |
|---|
| r | R Script File | Developer Files |
| ra | Real Audio | 聲音檔案 |
| ram | Real Audio metafile | 聲音檔案 |
| rar | RAR File | 壓縮檔案 |
| ratdvd | ratDVD DVD Image File | 磁碟映像檔 |
| raw | Raw Data File | 圖檔 |
| rb | Real Basic File | Developer Files |
| rbf | Windows Installer Rollback File | 備份檔案 |
| rbs | Windows Installer Rollback Script file | 備份檔案 |
| rc | Visual C++ Resource Script File | Developer Files |
| rcf | Colin McRae Configuration File | 遊戲檔案 |
| rcf | Rhapsody Storage File | 聲音檔案 |
| rdata | R Data File | 資料檔 |
| rdb | Redis Database File | 資料檔 |
| rdf | Resource Description File | 設定檔 |
| rec | Recorded File | 視頻檔案 |
| reg | Registry File | 設定檔 |
| regtrans-ms | Windows Registry Recovery Files | 備份檔案 |
| rels | Microsoft Office 2007 Relationships | Desktop Publishing |
| rem | Encrypted Data File | Misc Files |
| rep | GTA Replay File | 遊戲檔案 |
| req | FidoNet Request File | Misc Files |
| res | Compiled C, C++ resource File | Developer Files |
| resume | WinWay Deluxe Resume File | Layout Files |
| resx | Resource File | Misc Files |
| rez | Escape Velocity Nova Plugin File | 遊戲檔案 |
| rfl | Roll Forward Log File | 備份檔案 |
| rhp | Rhapsody Notation Program File Format | Misc Files |
| rif | Raster Image File | 圖檔 |
| ris | Research Information Systems Citation File | 文字檔 |
| rm | RealMedia | 視頻檔案 |
| rms | Secure Real Media File | 視頻檔案 |
| rmskin | Rainmaker Skin File | Misc Files |
| rmv | Radical Entertainment Video File | 視頻檔案 |
| rmvb | Real Media video file | 視頻檔案 |
| rnd | RandomSeed File | Misc Files |
| rom | Read Only Memory File | Misc Files |
| rpf | GTA IV Data Package File | 遊戲檔案 |
| rpl | ARMovie File | 遊戲檔案 |
| rpm | RPM Package Manager File | 壓縮檔案 |
| rpt | Report File | 資料檔 |
| rrr | Registry Mechanic Backup File | 備份檔案 |
| rsc | Compiled Resource File | 設定檔 |
| rsd | RealSQLDatabase File | 資料檔 |
| rsm | WinWay Deluxe Resume File | Layout Files |
| rsrc | Mac OS Resource Fork File | 系統檔案 |
| rtc | Live Meeting Connection File | Misc Files |
| rtf | Rich Text Format | 文字檔 |
| rtm | Real Tracker Module File | 聲音檔案 |
| rtp | Turbo Tax Update File | 系統檔案 |
| ru | JavaSoft Library File | 網頁檔案 |
| run | Runscanner Saved File | Misc Files |
| rus | Navitel Navigator Binary Map File | Geographical Files |
| rv | RealVideo Video File | 視頻檔案 |
| rvb | Rhinoscript File | Developer Files |
| rw2 | Panasonic RAW File | Misc Files |
| rwg | Random Word Generator List File | Misc Files |