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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 | Microsoft WordPad | Microsoft Corporation |
| .README | The Document Foundation | Text Files | Readme Text Document File | Microsoft WordPad | Microsoft Corporation |
| .RPT | SAP | Data Files | Crystal Reports File | Microsoft WordPad | Microsoft Corporation |
| .RST | David Goodger | Text Files | ReStructuredText File | Microsoft WordPad | Microsoft Corporation |
| .RTF | Microsoft Corporation | Text Files | Rich Text Format File | Microsoft WordPad | Microsoft Corporation |
| .RTL | Hewlett-Packard | Raster Image Files | Raster Transfer Language File | Microsoft WordPad | Microsoft Corporation |
| .RTX | The Document Foundation | Text Files | Rich Text Document | Microsoft WordPad | Microsoft Corporation |
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