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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .R | Open Source | Developer Files | R Script File | MacroMates TextMate | MacroMates |
| .RB | Larian Studios | Game Files | Divinity: Original Sin Game Data | MacroMates TextMate | MacroMates |
| .RBW | Yukihiro “Matz” Matsumoto | Developer Files | Ruby Script | MacroMates TextMate | MacroMates |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File | MacroMates TextMate | MacroMates |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | MacroMates TextMate | MacroMates |
| .RJS | Yukihiro “Matz” Matsumoto | Web Files | Ruby Javascript File | MacroMates TextMate | MacroMates |
| .RPT | SAP | Data Files | Crystal Reports File | MacroMates TextMate | MacroMates |
| .RPY | Team Shanghai Alice | Game Files | Touhou Project Replay File | MacroMates TextMate | MacroMates |
| .RTX | The Document Foundation | Text Files | Rich Text Document | MacroMates TextMate | MacroMates |
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