| .CHZ | Unknown Developer | Gecomprimeerde bestanden | ChArc Compressed File Archive | Unknown Software | Unknown Developer |
| .CJB | Autodesk, Inc. | Gecomprimeerde bestanden | Autodesk Cleaner XL Job | Autodesk Cleaner XL | Autodesk, Inc. |
| .CMP | Microsoft Corporation | Gecomprimeerde bestanden | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNR | David Harris | Gecomprimeerde bestanden | Pegasus Mail Mail Message Stored In Systemwide Folder | Pegasus Mail | David Harris |
| .CN_ | Microsoft Corporation | Gecomprimeerde bestanden | Compressed Windows Help Content | Microsoft Windows | Microsoft Corporation |
| .CPACK | Unknown Developer | Gecomprimeerde bestanden | Cpack Archive File | Cpack | SourceForge |
| .CPGZ | Open Source | Gecomprimeerde bestanden | Compressed UNIX CPIO Archive | Apple Archive Utility | Apple |
| .CPI | Sony | Gecomprimeerde bestanden | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CPT | Corel | Gecomprimeerde bestanden | Corel Photo-Paint Image | Corel Presentations X8 | Corel |
| .CPZ | Terry A. Davis | Gecomprimeerde bestanden | LoseThos C+ Source File | LoseThos | Terry A. Davis |
| .CSK | Apple | Gecomprimeerde bestanden | ClarisWorks Data | Apple AppleWorks | Apple |
| .CTW | Open Source | Gecomprimeerde bestanden | CTW Compressed File | CTW | Open Source |
| .CV | Microsoft Corporation | Gecomprimeerde bestanden | CodeView Data File | CodeView | Microsoft Corporation |
| .CZIP | Matteo Riso | Gecomprimeerde bestanden | ZipGenius CryptoZip File | WinInizio ZipGenius | Matteo Riso |
| .D02 | Cadence Design Systems | Gecomprimeerde bestanden | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D03 | Interscape | Gecomprimeerde bestanden | Jydivide Split File | Jydivide | Interscape |
| .DAR | Open Source | Gecomprimeerde bestanden | DAR Disk Archive File | DAR (Disk Archive) | Open Source |
| .DCS | Quark Software Inc. | Gecomprimeerde bestanden | Desktop Color Separation File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DD | Sage | Gecomprimeerde bestanden | Sage MAS 90 Data File | Sage MAS 90 | Sage |
| .DEB | Debian | Gecomprimeerde bestanden | Debian Software Package | IZArc | Ivan Zahariev |
| .DFL | Fresh Devices | Gecomprimeerde bestanden | Fresh Download List | Fresh Download | Fresh Devices |
| .DGC | Shin-ichi Tsuruta | Gecomprimeerde bestanden | DGCA File Archive | DGCA | Shin-ichi Tsuruta |
| .DIST | Apple | Gecomprimeerde bestanden | Mac OS X Distribution Script | MacroMates TextMate | MacroMates |
| .DL_ | Microsoft Corporation | Gecomprimeerde bestanden | Compressed DLL File | Microsoft Makecab | Microsoft Corporation |
| .DPK | Embarcadero Technologies | Gecomprimeerde bestanden | Delphi Package | Delphi (IDE) | Embarcadero Technologies |
| .DRZ | Unknown Developer | Gecomprimeerde bestanden | Draz Paint File | XnView MP | XnSoft |
| .DUR | Dmitry Shkarin | Gecomprimeerde bestanden | DURILCA Compressed Archive | DURILCA | Dmitry Shkarin |
| .DZ | Digital Extremes | Gecomprimeerde bestanden | Land Of The Dead Level File | Unreal Tournament | Epic Games |
| .E01 | GetData | Gecomprimeerde bestanden | EnCase Image File | PassMark OSForensics | PassMark Software |
| .EDZ | EPLAN Software & Service | Gecomprimeerde bestanden | EPLAN Electric P8 Data Archive Zipped File | EPLAN Electric P8 | EPLAN Software & Service |
| .EFW | Corel | Gecomprimeerde bestanden | Renamed Zip Or Executable File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .EGG | ESTsoft | Gecomprimeerde bestanden | ALZip Archive | The Unarchiver | Dag Agren, Circlesoft |
| .EGS | ESRI | Gecomprimeerde bestanden | GIS Software Encrypted Grid Shape Data | ArcGIS | ESRI |
| .ENK | SAP | Gecomprimeerde bestanden | Sybase Enterprise Portal Security Key | Sybase Enterprise Portal | SAP |
| .EP2 | Green Eclipse | Gecomprimeerde bestanden | EclipsePackager Package File | EclipsePackager | Green Eclipse |
| .EPI | Green Eclipse | Gecomprimeerde bestanden | EclipsePackager2000 Compressed File | EclipsePackager | Green Eclipse |
| .ESA | Enveloc, Inc. | Gecomprimeerde bestanden | Enveloc Secure Archive | Enveloc Backup | Enveloc, Inc. |
| .ES_ | Igor Pavlov | Gecomprimeerde bestanden | Sounder Compressed File | 7-Zip | Igor Pavlov |
| .EVZ | Open Source | Gecomprimeerde bestanden | Zipped EVO Record File | EVOPlayer | Open Source |
| .EWZ | Qivx, Inc. | Gecomprimeerde bestanden | EdgeWize Compressed Encoded Data File | Unknown Software | Unknown Developer |
| .EX_ | Microsoft Corporation | Gecomprimeerde bestanden | Compressed EXE File | Windows Installer | Microsoft Corporation |
| .F | The Eclipse Foundation | Gecomprimeerde bestanden | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FB | Serge Voskoboynikov | Gecomprimeerde bestanden | Slim! Compressed Archive | Slim! | Serge Voskoboynikov |
| .FCX | Patton & Patton Software | Gecomprimeerde bestanden | Flow Charting Diagram File | Flow Charting | Patton & Patton Software |
| .FFR | Unknown Developer | Gecomprimeerde bestanden | FFR Compressed Archive | Unknown Software | Unknown Developer |
| .FGZ | Unknown Developer | Gecomprimeerde bestanden | Formula Graphics Standalone Presentation Archive | Formula Graphics | Unknown Developer |
| .FRP | Delrina | Gecomprimeerde bestanden | PerForm Or FormFlow Form File Format | PerForm | Delrina |
| .GCA | Ivan Zahariev | Gecomprimeerde bestanden | GCA File Archive | IZArc | Ivan Zahariev |
| .GCF | Valve | Gecomprimeerde bestanden | Game Cache File | Steam | Valve |
| .GIP | Ethalone Solutions Inc. | Gecomprimeerde bestanden | Ghost Installer Package | Ghost Installer | Ethalone Solutions Inc. |
| .GMZ | YoYo Games | Gecomprimeerde bestanden | Compressed GameMaker File | GameMaker Studio | YoYo Games |
| .GZ | GNU Project | Gecomprimeerde bestanden | Gnu Zipped Archive | 7-Zip | Igor Pavlov |
| .GZA | Ivan Zahariev | Gecomprimeerde bestanden | IZArc BGA Archive File | IZArc | Ivan Zahariev |
| .HA | Ivan Zahariev | Gecomprimeerde bestanden | HA Compressed Archive | WinRAR | Eugene Roshal |
| .HAL | HansaWorld | Gecomprimeerde bestanden | HansaWorld Enterprise HAL Code File | HansaWorld Enterprise | HansaWorld |
| .HAP | Hamarsoft | Gecomprimeerde bestanden | HAP Compressed File Archive | HAP | Hamarsoft |
| .HBC | Xceleon Technologies | Gecomprimeerde bestanden | HyperBac Compressed Archive | SQL HyperBac | Redgate Software |
| .HBC2 | Xceleon Technologies | Gecomprimeerde bestanden | HyperBac Compressed File Archive | SQL HyperBac | Redgate Software |
| .HBE | Xceleon Technologies | Gecomprimeerde bestanden | HyperBac Compressed Archive | SQL HyperBac | Redgate Software |
| .HKI | WinHKI | Gecomprimeerde bestanden | WinHKI Compressed Archive | WinHKI Archiver | WinHKI |
| .HKI1 | WinHKI | Gecomprimeerde bestanden | WinHKI HKI1 Archive | WinHKI Archiver | WinHKI |
| .HKI2 | WinHKI | Gecomprimeerde bestanden | WinHKI HKI2 Archive | WinHKI Archiver | WinHKI |
| .HKI3 | WinHKI | Gecomprimeerde bestanden | WinHKI HKI3 Archive | WinHKI Archiver | WinHKI |
| .HLZ | European Southern Observatory | Gecomprimeerde bestanden | ESO MIDAS Help ASCII File | ESO-MIDAS | European Southern Observatory |
| .HPK | Interscape | Gecomprimeerde bestanden | HPack Compressed Archive | HPack | Interscape |
| .HP_ | Microsoft Corporation | Gecomprimeerde bestanden | Winhelp Compressed File | Microsoft Windows Help | Microsoft Corporation |
| .HYP | Interscape | Gecomprimeerde bestanden | HYPER Compressed Archive | Hyper | Interscape |
| .HZQ | Rowley Associates Ltd | Gecomprimeerde bestanden | CrossWorks For ARM Package | CrossWorks for ARM | Rowley Associates Ltd |
| .IBF | Square Enix | Gecomprimeerde bestanden | Final Fantasy XI Game Data | Final Fantasy XI | Square Enix |
| .IBM | Commodore International | Gecomprimeerde bestanden | Commodore Amiga Graphics Data | Ability Office | Ability Plus Software |
| .ICE | Raphaël et Béatrice Mounier | Gecomprimeerde bestanden | ICE File Archive | ALZip | ESTsoft |
| .IFU | Towodo Software | Gecomprimeerde bestanden | Towodo All Image | All Image | Towodo Software |
| .INV | Copyboy | Gecomprimeerde bestanden | INVedit File | INVedit | Copyboy |
| .IO | Open Source | Gecomprimeerde bestanden | CPIO Compressed File Archive | Linux | Open Source |
| .IPG | Apple | Gecomprimeerde bestanden | iPod Game File | Apple iTunes | Apple |
| .IPK | Open Source | Gecomprimeerde bestanden | Itsy Package | Debian software (dpkg) | Open Source |
| .IRZ | Open Source | Gecomprimeerde bestanden | iROS Application Packaging Unit | iROS | Open Source |
| .ISH | Interscape | Gecomprimeerde bestanden | ISH Compressed Archive | HiroRAR | Interscape |
| .ISX | ESI ITI GmbH | Gecomprimeerde bestanden | SimulationX Project | SimulationX | ESI ITI GmbH |
| .ITA | Unknown Developer | Gecomprimeerde bestanden | IconTweaker Theme Archive | IconTweaker | Unknown Developer |
| .J | Oracle Corporation | Gecomprimeerde bestanden | Java Source File | Vim | Bram Moolenaar |
| .JA | Trainz portal | Gecomprimeerde bestanden | Jet Archive | N3V Games Trainz Simulator | Trainz portal |
| .JAR | Oracle Corporation | Gecomprimeerde bestanden | Java Archive File | 7-Zip | Igor Pavlov |
| .JIGDO | Richard Atterer | Gecomprimeerde bestanden | Jigsaw Download Instruction File | Jigdo | Richard Atterer |
| .JP4 | Open Source | Gecomprimeerde bestanden | Elphel Project Data | Elphel Project | Open Source |
| .JPQ | Open Source | Gecomprimeerde bestanden | JPQ (Jared Package) Library Archive | JPQ (Jared Package) Library | Open Source |
| .JSO | Sony | Gecomprimeerde bestanden | PSP ISO Compressor | JISO | isocompressor.com |
| .KEP | Embarcadero Technologies | Gecomprimeerde bestanden | Turbo Pascal DOS Tp19 Compressed Kepler File | Turbo Pascal | Embarcadero Technologies |
| .KEY | Unknown Developer | Gecomprimeerde bestanden | License/ Encrypted Security Key File | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .KGB | Open Source | Gecomprimeerde bestanden | KGB Archive File | KGB Archiver | Open Source |
| .KVA | Open Source | Gecomprimeerde bestanden | KVIrc Compressed Archive | KVIrc | Open Source |
| .KZ | KuaiZip | Gecomprimeerde bestanden | KuaiZip Compressed File | KuaiZip | KuaiZip |
| .LAYOUT | Apple | Gecomprimeerde bestanden | Apple MainStage Layout Data | Logic Studio | Apple |
| .LBR | Dag Agren, Circlesoft | Gecomprimeerde bestanden | LU Library Archive | The Unarchiver | Dag Agren, Circlesoft |
| .LG | Unknown Developer | Gecomprimeerde bestanden | Arhangel Compressed Archive | Unknown Software | Unknown Developer |
| .LHA | WinAbility Software | Gecomprimeerde bestanden | LHARC Compressed Archive | 7-Zip | Igor Pavlov |
| .LHARC | WinAbility Software | Gecomprimeerde bestanden | LHARC Compressed Archive | 7-Zip | Igor Pavlov |
| .LHW | Jonathan Forbes | Gecomprimeerde bestanden | LHWarp Compressed Amiga Archive | LHWarp | Jonathan Forbes |
| .LHZD | BeLight Software | Gecomprimeerde bestanden | Live Home 3D Compressed Project | Live Home 3D | BeLight Software |
| .LIF | The LEGO Group | Gecomprimeerde bestanden | LEGO Digital Designer Assets File | LEGO Digital Designer | The LEGO Group |
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