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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .R06 | Eugene Roshal | Backup Files | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R10 | Symantec Corporation | Backup Files | Norton Ghost RAR File | Symantec Ghost Solution Suite | Symantec Corporation |
| .RAC | Concept2 Inc. | Backup Files | Venue Race Application File Format | Venue Race Application | Concept2 Inc. |
| .RAQ | Sun Microsystems | Backup Files | Cobalt Server Backup | Cobalt Qube | Cobalt Networks |
| .RB4 | Sarm Software | Backup Files | Resume Builder 4 File | Sarm Resume Builder | Sarm Software |
| .RB5 | Trend Micro | Backup Files | Trend Micro AntiVirus Backup File | Trend Micro Antivirus | Trend Micro |
| .RB6 | Various Developers | Backup Files | Backup File | Zapback | Zaplots Games, Inc. |
| .RB9 | Trend Micro | Backup Files | Anti-Virus Backup | Trend Micro Antivirus | Trend Micro |
| .RBC | IBM | Backup Files | Rembo-C Script | Rembo Toolkit | Open Source |
| .RBF | Microsoft Corporation | Backup Files | Windows Installer Rollback File | Windows Installer | Microsoft Corporation |
| .RBK | Microsoft Corporation | Backup Files | Windows 95 Registry Backup File | PC Tools Registry Mechanic | Symantec Corporation |
| .RBR | NICE Ltd. | Backup Files | NICE Wordnet Backup File | Wordnet | NICE Ltd. |
| .RBS | Microsoft Corporation | Backup Files | Windows Installer Rollback Script File | Windows Installer | Microsoft Corporation |
| .RDB | EMC | Backup Files | Retrospect Backup Set | Retrospect | Retrospect Inc. |
| .RDO | Xerox | Backup Files | Xerox Rawster Document Object File | Xerox Document Scan and Make Ready | Xerox |
| .REC | TOPFIELD Co., Ltd. | Backup Files | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .RGU | Kroll Ontrack | Backup Files | Data Recovery Software File | Data Recovery Software | Kroll Ontrack |
| .RIM | BioWare | Backup Files | BioWare Resource Image File | BioWare Neverwinter Nights | BioWare |
| .RKN | Reckon | Backup Files | Reckon Accounts Personal Plus Backup | Accounts Personal Plus | Reckon |
| .RMB | SCRIPTMATION | Backup Files | RegistryMaster Data File | RegistryMaster | SCRIPTMATION |
| .RRR | Symantec Corporation | Backup Files | Registry Mechanic Backup File | PC Tools Registry Mechanic | Symantec Corporation |
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