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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .RAT | World Wide Web Consortium (W3C) | Uncommon Files | PICS Rating File | Notepad++ | Don Ho |
| .RCJ | Microsoft Corporation | Text Files | Robocopy Job File | Notepad++ | Don Ho |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File | Notepad++ | Don Ho |
| .README | The Document Foundation | Text Files | Readme Text Document File | Notepad++ | Don Ho |
| .REPORT | Sublime HQ Pty Ltd | Data Files | Report File | Notepad++ | Don Ho |
| .RJS | Yukihiro “Matz” Matsumoto | Web Files | Ruby Javascript File | Notepad++ | Don Ho |
| .RPT | SAP | Data Files | Crystal Reports File | Notepad++ | Don Ho |
| .RPY | Team Shanghai Alice | Game Files | Touhou Project Replay File | Notepad++ | Don Ho |
| .RTL | Hewlett-Packard | Raster Image Files | Raster Transfer Language File | Notepad++ | Don Ho |
| .RTX | The Document Foundation | Text Files | Rich Text Document | Notepad++ | Don Ho |
| .RU | Microsoft Corporation | Text Files | Russian Text Or Localization File | Notepad++ | Don Ho |
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