| .NV3 | Unknown Developer | Back-upbestanden | Visicontrol MVS-30/35/40 Flash-memory Backup | Unknown Software | Unknown Developer |
| .OB | Innoshock | Back-upbestanden | Orbit Downloader Incomplete Download | Orbit Downloader | Innoshock |
| .OBK | O&O Software | Back-upbestanden | DiskImage Backup File | O&O DiskImage | O&O Software |
| .OCH | WorldWideSatellites | Back-upbestanden | Satellite And Channel Settings Backup | Viewsat Pro | WorldWideSatellites |
| .OEB | IDPF (International Digital Publishing Forum) | Back-upbestanden | Open eBook File | Adobe InDesign | Adobe Systems Incorporated |
| .OFB | Oxgen Forensics | Back-upbestanden | Oxygen Forensic Suite Backup | Oxygen Forensic Detective | Oxgen Forensics |
| .OLD | Unknown Developer | Back-upbestanden | Backup Archive File | Unknown Software | Unknown Developer |
| .ONEPKG | Microsoft Corporation | Back-upbestanden | Microsoft OneNote Package File | Microsoft OneNote | Microsoft Corporation |
| .ORI | Unknown Developer | Back-upbestanden | Original File | Unknown Software | Unknown Developer |
| .ORIG | Unknown Developer | Back-upbestanden | Original File | Unknown Software | Unknown Developer |
| .OVB | OnkoS | Back-upbestanden | OnkoS Vocabulary Backup | Unknown Software | Unknown Developer |
| .P00 | HERE | Back-upbestanden | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P02 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P03 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P04 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P07 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P08 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P10 | Open Source | Back-upbestanden | Certificate Request File | Apple Mail | Apple |
| .P11 | HERE | Back-upbestanden | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P13 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P14 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P15 | HERE | Back-upbestanden | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P17 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P18 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P19 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P2V | 3d-in-berlin | Back-upbestanden | PLAN2VIZ Backup Design Plan | PLAN2VIZ | 3d-in-berlin |
| .P30 | Peter B. Clements | Back-upbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P3C | Oracle Corporation | Back-upbestanden | Primavera Project Planner Compressed Backup | Primavera | Oracle Corporation |
| .PAQ | Hewlett-Packard | Back-upbestanden | Hewlett-Packard (HP) Software Restore File | Corel WinZip 21 | Corel |
| .PB1 | Broderbund | Back-upbestanden | Broderbund 3D Home Architect Data | 3D Home Architect | Broderbund |
| .PBA | Oracle Corporation | Back-upbestanden | OpenOffice.org Basic Protected Module File | Apache OpenOffice | Apache Software Foundation |
| .PBB | AT&T Labs | Back-upbestanden | AT&T Phonebook File | CellBrite Mobile Synchronization Content Manager | Cellebrite |
| .PBD | EaseUS | Back-upbestanden | EaseUS Todo Backup Backup File | EaseUS Todo Backup | EaseUS |
| .PBF | Paragon Software Group | Back-upbestanden | Paragon Backup File | Paragon Backup & Recovery | Paragon Software Group |
| .PBR | Sybase, Inc | Back-upbestanden | PowerBuilder Resource File | PowerBuilder | SAP |
| .PCA | Sony | Back-upbestanden | Perfect Clarity Audio File | ACID Pro 7 | Magix Software GmbH |
| .PCU | PC MightyMax | Back-upbestanden | PC MightyMax Undo File | PC MightyMax | PC MightyMax |
| .PD2 | Jan van Wijk | Back-upbestanden | DFSee Partition Table And Boot Sector Backup | DFSee | Jan van Wijk |
| .PD3 | Autodesk, Inc. | Back-upbestanden | 3D Studio Max Data | Autodesk 3ds Max | Autodesk, Inc. |
| .PD4 | Jan van Wijk | Back-upbestanden | DFSee Partition Table And Boot Sector Backup | DFSee | Jan van Wijk |
| .PFI | Paragon Software Group | Back-upbestanden | Paragon Backup Index File | Paragon Backup & Recovery | Paragon Software Group |
| .PQB | Pleco Inc. | Back-upbestanden | Pleco Chinese Dictionary Backup File | Pleco Chinese Dictionary | Pleco Inc. |
| .PQB-BACKUP | Pleco Inc. | Back-upbestanden | Pleco Chinese Dictionary Backup File | Pleco Chinese Dictionary | Pleco Inc. |
| .PRV | E-on Software, Inc. | Back-upbestanden | Vue Preview File | E-on Vue | E-on Software, Inc. |
| .PSA | Epic Games | Back-upbestanden | Unreal Engine Skeletal Animation File | Unreal Tournament | Epic Games |
| .PTB | Sage | Back-upbestanden | Sage 50 Backup File | Sage 50 | Sage |
| .PVC | Panasonic Corporation | Back-upbestanden | Panasonic VM1 Voice File | Panasonic Mini Player (VS2_VM1_Player.exe) | Panasonic Corporation |
| .PXO | Open Source | Back-upbestanden | PicoBackup Backup Script | PicoBackup | Open Source |
| .QB2015 | Intuit, Inc. | Back-upbestanden | QuickBooks 2015 Backup | QuickBooks | Intuit, Inc. |
| .QBB | Intuit, Inc. | Back-upbestanden | QuickBooks Backup File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QBK | Intuit, Inc. | Back-upbestanden | QuickTax Backup File | Intuit TurboTax | Intuit, Inc. |
| .QBM | Intuit, Inc. | Back-upbestanden | QuickBooks Portable Company File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QBX | Intuit, Inc. | Back-upbestanden | QuickBooks Accountant Transfer File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QCN | Qualcomm | Back-upbestanden | Qualcomm QPST Drive Backup | Qualcomm Product Support Tools (QPST) | Qualcomm |
| .QIC | Microsoft Corporation | Back-upbestanden | Windows Backup File | Microsoft Windows Backup Utility | Microsoft Corporation |
| .QLE | id Software | Back-upbestanden | Quake Object Oriented Level Editor (QOOLE) File | Quake | id Software |
| .QMD | Quicken | Back-upbestanden | Intuit Quicken | Intuit Quicken | Quicken |
| .QSF | Qualtrics | Back-upbestanden | Qualtrics Survey File | Qualtrics Survey Solutions (online) | Qualtrics |
| .R06 | Eugene Roshal | Back-upbestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R10 | Symantec Corporation | Back-upbestanden | Norton Ghost RAR File | Symantec Ghost Solution Suite | Symantec Corporation |
| .RAC | Concept2 Inc. | Back-upbestanden | Venue Race Application File Format | Venue Race Application | Concept2 Inc. |
| .RAQ | Sun Microsystems | Back-upbestanden | Cobalt Server Backup | Cobalt Qube | Cobalt Networks |
| .RB4 | Sarm Software | Back-upbestanden | Resume Builder 4 File | Sarm Resume Builder | Sarm Software |
| .RB5 | Trend Micro | Back-upbestanden | Trend Micro AntiVirus Backup File | Trend Micro Antivirus | Trend Micro |
| .RB6 | Various Developers | Back-upbestanden | Backup File | Zapback | Zaplots Games, Inc. |
| .RB9 | Trend Micro | Back-upbestanden | Anti-Virus Backup | Trend Micro Antivirus | Trend Micro |
| .RBC | IBM | Back-upbestanden | Rembo-C Script | Rembo Toolkit | Open Source |
| .RBF | Microsoft Corporation | Back-upbestanden | Windows Installer Rollback File | Windows Installer | Microsoft Corporation |
| .RBK | Microsoft Corporation | Back-upbestanden | Windows 95 Registry Backup File | PC Tools Registry Mechanic | Symantec Corporation |
| .RBR | NICE Ltd. | Back-upbestanden | NICE Wordnet Backup File | Wordnet | NICE Ltd. |
| .RBS | Microsoft Corporation | Back-upbestanden | Windows Installer Rollback Script File | Windows Installer | Microsoft Corporation |
| .RDB | EMC | Back-upbestanden | Retrospect Backup Set | Retrospect | Retrospect Inc. |
| .RDO | Xerox | Back-upbestanden | Xerox Rawster Document Object File | Xerox Document Scan and Make Ready | Xerox |
| .REC | TOPFIELD Co., Ltd. | Back-upbestanden | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .RGU | Kroll Ontrack | Back-upbestanden | Data Recovery Software File | Data Recovery Software | Kroll Ontrack |
| .RIM | BioWare | Back-upbestanden | BioWare Resource Image File | BioWare Neverwinter Nights | BioWare |
| .RKN | Reckon | Back-upbestanden | Reckon Accounts Personal Plus Backup | Accounts Personal Plus | Reckon |
| .RMB | SCRIPTMATION | Back-upbestanden | RegistryMaster Data File | RegistryMaster | SCRIPTMATION |
| .RRR | Symantec Corporation | Back-upbestanden | Registry Mechanic Backup File | PC Tools Registry Mechanic | Symantec Corporation |
| .SAV | Nintendo | Back-upbestanden | Saved Game File | No Cash GBA (No$GBA) | Martin Korth |
| .SBAK | Conquer Internet Ltd. | Back-upbestanden | Ideal Summary Sheets Standard Backup (Non-Encrypted) | Ideal Summary Sheets | Conquer Internet Ltd. |
| .SBB | Microsoft Corporation | Back-upbestanden | Office Accounting Company Backup File | Microsoft Office Accounting | Microsoft Corporation |
| .SBK | SwishZone | Back-upbestanden | SWiSH Project Backup File | SWiSH Max | SwishZone |
| .SBS | Allegorithmic | Back-upbestanden | Substance Package | Substance Designer | Allegorithmic |
| .SBU | Samsung Electronics | Back-upbestanden | Samsung Backup File | Samsung Kies | Samsung Electronics |
| .SDC | Stardock Corporation | Back-upbestanden | Stardock Central Download Archive | Stardock Central | Stardock Corporation |
| .SIK | Microsoft Corporation | Back-upbestanden | Microsoft Word Backup | Microsoft Word | Microsoft Corporation |
| .SIM | Valve | Back-upbestanden | Steam Game Backup Information File | Steam | Valve |
| .SIS | Valve | Back-upbestanden | Steam Game Backup Information File | Steam | Valve |
| .SKB | Trimble Inc. | Back-upbestanden | SketchUp Backup Document | SketchUp | Trimble Inc. |
| .SME | Samsung Electronics | Back-upbestanden | Samsung Mobile Backup File | Samsung Kies | Samsung Electronics |
| .SMEA | Samsung Electronics | Back-upbestanden | Samsung Kies Messages Backup | Samsung Kies | Samsung Electronics |
| .SN1 | Tom Ehlert Software | Back-upbestanden | Drive Snapshot First Differential Backup | Tom Ehlert Drive Snapshot | Tom Ehlert Software |
| .SN2 | Tom Ehlert Software | Back-upbestanden | Drive Snapshot Second Differential Backup | Tom Ehlert Drive Snapshot | Tom Ehlert Software |
| .SN3 | Samsung Electronics | Back-upbestanden | Samsung Kies 2 Backup | Samsung Kies | Samsung Electronics |
| .SNA | Tom Ehlert Software | Back-upbestanden | Drive Snapshot Primary Backup File | Tom Ehlert Drive Snapshot | Tom Ehlert Software |
| .SNBKP | Samsung Electronics | Back-upbestanden | S Note Note Backup | S Note | Samsung Electronics |
| .SNS | FFmpeg team | Back-upbestanden | SNS Video Game Audio File | FFmpeg | FFmpeg team |
| .SNZ | Google | Back-upbestanden | Snappy SNZ Compressed File | Snappy | Google |
| .SPBA | Samsung Electronics | Back-upbestanden | Samsung Kies Contacts Backup | Samsung Kies | Samsung Electronics |
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