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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .R00 | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | Xarchiver | SourceForge |
| .RAR | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | Xarchiver | SourceForge |
| .RASMOL | Roger Sayle | Uncommon Files | RasMol File | RasMol | SourceForge |
| .README | The Document Foundation | Text Files | Readme Text Document File | Vi | SourceForge |
| .REX | Propellerhead | Audio Files | ReCycle Loop File | Regina Rexx Interpreter | SourceForge |
| .REXX | SourceForge | Developer Files | Rexx Source | Regina Rexx Interpreter | SourceForge |
| .RTX | The Document Foundation | Text Files | Rich Text Document | Vi | SourceForge |
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