| .LIM | Unknown Developer | Gecomprimeerde bestanden | Limit Compressed Data | Unknown Software | Unknown Developer |
| .LIZ | Unknown Developer | Gecomprimeerde bestanden | Compressed List File | Unknown Software | Unknown Developer |
| .LNX | Commodore International | Gecomprimeerde bestanden | Commodore 64 Lynx Archive | VICE | Open Source |
| .LOK | CursorArts Company | Gecomprimeerde bestanden | FileWrangler Archive | FileWrangler | CursorArts Company |
| .LQR | Europoe Space Agency (ESA) | Gecomprimeerde bestanden | LBR Library File | LBR library software | Unknown Developer |
| .LRZ | Open Source | Gecomprimeerde bestanden | Lrzip Compressed Archive | Lrzip | Open Source |
| .LVU | Livid Instruments | Gecomprimeerde bestanden | Livid Union Project File | Livid Union | Livid Instruments |
| .LZ | Antonio Diaz Diaz | Gecomprimeerde bestanden | Lzip Compressed File | Lzip | Antonio Diaz Diaz |
| .LZH | Various Developers | Gecomprimeerde bestanden | LZH Compressed File | 7-Zip | Igor Pavlov |
| .LZM | Open Source | Gecomprimeerde bestanden | Slax Module | Slax | Open Source |
| .LZMA | Igor Pavlov | Gecomprimeerde bestanden | LZMA Compressed File | 7-Zip | Igor Pavlov |
| .LZO | Open Source | Gecomprimeerde bestanden | LZO Compressed File | Corel WinZip 21 | Corel |
| .LZS | Open Source | Gecomprimeerde bestanden | LARC Compressed File Archive | ZipZag | Open Source |
| .LZW | Unknown Developer | Gecomprimeerde bestanden | LZW Compressed Archive File | Unknown Software | Unknown Developer |
| .LZX | Open Source | Gecomprimeerde bestanden | Amiga LZX Compressed File | The Unarchiver | Dag Agren, Circlesoft |
| .M3K | Unknown Developer | Gecomprimeerde bestanden | Interactive Digital Content File | Unknown Software | Unknown Developer |
| .MC_ | Unknown Developer | Gecomprimeerde bestanden | Musicato Compressed File | Unknown Software | Unknown Developer |
| .MD | Various Developers | Gecomprimeerde bestanden | Markdown Documentation File | Microsoft Notepad | Microsoft Corporation |
| .MD5 | Ron Rivest | Gecomprimeerde bestanden | MD5 Checksum File | TeraCopy | Code Sector |
| .MINT | Open Source | Gecomprimeerde bestanden | Linux Mint Installer File | Linux Mint | Open Source |
| .MLU | Unknown Developer | Gecomprimeerde bestanden | Unknown Zip File | WinRAR | Eugene Roshal |
| .MMT | Open Source | Gecomprimeerde bestanden | Nimbus 7 SAMS Data File | Microsoft Notepad | Microsoft Corporation |
| .MOU | Winmount International Inc. | Gecomprimeerde bestanden | WinMount Compressed File | WinMount International WinMount | Winmount International Inc. |
| .MPKG | Open Source | Gecomprimeerde bestanden | Meta Package File | Linux | Open Source |
| .MRT | Stimulsoft | Gecomprimeerde bestanden | Stimulsoft Report File | Stimulsoft Reports.Ultimate | Stimulsoft |
| .MSA | Unknown Developer | Gecomprimeerde bestanden | Magic Shadow Archiver Atari Disk Image | Magic Shadow Archiver | Unknown Developer |
| .MVA | Microsoft Corporation | Gecomprimeerde bestanden | Microsoft Setup Archive | Microsoft Windows | Microsoft Corporation |
| .MZF | Unknown Developer | Gecomprimeerde bestanden | MediaZip Archive | MediaZip | Unknown Developer |
| .MZP | Autodesk, Inc. | Gecomprimeerde bestanden | MAXScript Zip Package | Autodesk 3ds Max | Autodesk, Inc. |
| .NEX | Opera Software | Gecomprimeerde bestanden | Navigator Extension | Opera | Opera Software |
| .NGR | NEPLAN AG | Gecomprimeerde bestanden | NEPLAN Graphic Data | NEPLAN Electricity | NEPLAN AG |
| .NPK | MikroTik | Gecomprimeerde bestanden | MikroTik Software Package | Upload NPK file to MikroTrik router | MikroTik |
| .NZ | Sami Runsas | Gecomprimeerde bestanden | NanoZip Compressed File | NanoZip | Sami Runsas |
| .OAP | Samsung Electronics | Gecomprimeerde bestanden | Samsung Bada Signed Installation Package | Bada SDK | Samsung Electronics |
| .OBR | Micro Focus International plc | Gecomprimeerde bestanden | Borland C++ Object Browser Data | Borland C++ | Micro Focus International plc |
| .OC_ | Microsoft Corporation | Gecomprimeerde bestanden | Compressed ActiveX Control File | Microsoft Windows | Microsoft Corporation |
| .OMB | Alfega Technologies | Gecomprimeerde bestanden | Omnibus Offline Web Storage | Omnibus | Alfega Technologies |
| .OOP | Unknown Developer | Gecomprimeerde bestanden | OOP Packer Archive | OOP Packer | Unknown Developer |
| .P01 | HERE | Gecomprimeerde bestanden | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P06 | Bentley Systems | Gecomprimeerde bestanden | MicroStation Modification Project Resource File | MicroStation | Bentley Systems |
| .PACKAGE | Electronic Arts | Gecomprimeerde bestanden | Electronic Arts Game Package File | Electronic Arts The Sims 2 | Electronic Arts |
| .PAE | ConeXware | Gecomprimeerde bestanden | PowerArchiver Encrypted Archive | PowerArchiver | ConeXware |
| .PAK | Unknown Developer | Gecomprimeerde bestanden | Video Game Package | Dragon UnPACKer | Open Source |
| .PAQ6 | Open Source | Gecomprimeerde bestanden | PAQ6 Data Archive | KGB Archiver | Open Source |
| .PAQ7 | Open Source | Gecomprimeerde bestanden | PAQ7 Data Archive | PeaZip | Open Source |
| .PAQ8 | Open Source | Gecomprimeerde bestanden | PAQ8 Data Archive | PAQ8 | Open Source |
| .PAQ8P | PAQ8P | Gecomprimeerde bestanden | PAQ8L Data Archive | PAQ8 | Open Source |
| .PAR | Siemens PLM Software | Gecomprimeerde bestanden | Solid Edge Part File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .PAR2 | Open Source | Gecomprimeerde bestanden | Parchive 2 Index File | QuickPar | Open Source |
| .PART1 | NetObjects | Gecomprimeerde bestanden | NetObjects Fusion System Data | NetObjects Fusion | NetObjects |
| .PAX | Portable Operating System Interface (POSIX) Consortium | Gecomprimeerde bestanden | PAX Archive | 7-Zip | Igor Pavlov |
| .PBI | The FreeBSD Community | Gecomprimeerde bestanden | PC BSD Installer Package | FreeBSD | The FreeBSD Community |
| .PBK | Microsoft Corporation | Gecomprimeerde bestanden | Dial-Up Phone Book File | Microsoft Windows | Microsoft Corporation |
| .PCV | Mozilla | Gecomprimeerde bestanden | MozBackup Profile Backup | Corel WinZip 21 | Corel |
| .PEA | Open Source | Gecomprimeerde bestanden | PEA File Archive | PeaZip | Open Source |
| .PET | Larry Short, Mick Amadio and Puppy community | Gecomprimeerde bestanden | Puppy Linux Install Package | 7-Zip | Igor Pavlov |
| .PF | Smith Micro Software | Gecomprimeerde bestanden | Private File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PGZ | Open Source | Gecomprimeerde bestanden | StreamLync Ownload Archives | ZipZag | Open Source |
| .PIM | Avid Technology | Gecomprimeerde bestanden | Pro Tools Controller Plug-in Mappings File | Avid Pro Tools | Avid Technology |
| .PIT | Samsung Electronics | Gecomprimeerde bestanden | Samsung Phone Firmware File | Google Android | Google |
| .PIZ | Winrar | Gecomprimeerde bestanden | Zipped File | 7-Zip | Igor Pavlov |
| .PKD | Power Karaoke | Gecomprimeerde bestanden | Power Karaoke Project | Power Karaoke | Power Karaoke |
| .PKG | Apple | Gecomprimeerde bestanden | Apple MacOS Installer Package | macOS | Apple |
| .PKV | Valve | Gecomprimeerde bestanden | Steam Package Data | Steam | Valve |
| .PKZ | Piboso | Gecomprimeerde bestanden | Kart Racing Pro Track Data | Kart Racing Pro | Piboso |
| .PMA | David Harris | Gecomprimeerde bestanden | Pegasus Mail Data Archive File | Pegasus Mail | David Harris |
| .PPC | Garmin | Gecomprimeerde bestanden | XMap Flight Plan Statistic File | XMap | Garmin |
| .PSZ | Igor Pavlov | Gecomprimeerde bestanden | Compressed PostScript File | WinZip | Corel |
| .PUP | Sony | Gecomprimeerde bestanden | PlayStation 3 Update File | PS3 PUP Extractor | Interscape |
| .PUT | Micro Fox Software | Gecomprimeerde bestanden | PUT Compressed Data | Unknown Software | Unknown Developer |
| .PUZ | Literate Software | Gecomprimeerde bestanden | Across Lite Crossword Puzzle | Across Lite | Literate Software |
| .PZ | XnSoft | Gecomprimeerde bestanden | Compressed PNG Image | XnView MP | XnSoft |
| .QCH | Quicken | Gecomprimeerde bestanden | Quicken DOS Data File | Intuit Quicken | Quicken |
| .QDA | SANDMAN | Gecomprimeerde bestanden | Quadruple D Archive File | Quadruple D Archiver | SANDMAN |
| .QTA | Unknown Developer | Gecomprimeerde bestanden | Qtar Archive | Unknown Software | Unknown Developer |
| .QUAD | Open Source | Gecomprimeerde bestanden | QUAD Compressed Archive File | QUAD | Open Source |
| .R00 | Rocky Sand Studio | Gecomprimeerde bestanden | WinRAR Compressed Archive | 7-Zip | Igor Pavlov |
| .R01 | Various Developers | Gecomprimeerde bestanden | WinRAR Split Archive Part 1 | 7-Zip | Igor Pavlov |
| .R02 | Eugene Roshal | Gecomprimeerde bestanden | WinRAR Split Archive Part 2 | 7-Zip | Igor Pavlov |
| .R03 | Winrar | Gecomprimeerde bestanden | WinRAR Split Archive Part 3 | 7-Zip | Igor Pavlov |
| .R04 | Winrar | Gecomprimeerde bestanden | WinRAR Split Archive Part 4 | 7-Zip | Igor Pavlov |
| .R06 | Eugene Roshal | Gecomprimeerde bestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R07 | Eugene Roshal | Gecomprimeerde bestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R09 | Eugene Roshal | Gecomprimeerde bestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R30 | Eugene Roshal | Gecomprimeerde bestanden | WinRAR Split Archive Part 30 | WinRAR | Eugene Roshal |
| .R36 | Eugene Roshal | Gecomprimeerde bestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R50 | Eugene Roshal | Gecomprimeerde bestanden | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .R51 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R52 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R53 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R54 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R55 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R56 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R58 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R59 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R80 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R81 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R83 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R84 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R85 | Eugene Roshal | Gecomprimeerde bestanden | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
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