| .KCD | Symantec Corporation | Gegevensbestanden | Rshiphop.kcd Malware | Kayak | Open Source |
| .KDB | Open Source | Databasebestanden | KeePass Database File | KeePass Password Safe | Open Source |
| .KDBX | Dominik Reichl | Gegevensbestanden | KeePass Password Database | KeePass Password Safe | Open Source |
| .KDEVELOP | Free Software Foundation | Ontwikkelaarsbestanden | KDevelop Project Data File | KDevelop | Open Source |
| .KDEVPRJ | Free Software Foundation | Ontwikkelaarsbestanden | KDevelop Project File | KDevelop | Open Source |
| .KDS | Knyzhov Dmitry | Instellingsbestanden | KD Player Skin File | gVim | Open Source |
| .KEA | Panasonic Corporation | Gegevensbestanden | Panasonic KTS File | KEALib software | Open Source |
| .KEYSTORE | Oracle Corporation | Versleutelde bestanden | Java Keystore File | KeyStore Explorer | Open Source |
| .KFI | Unknown Developer | 3D-bestanden | 3D Forgastest Editor Data | 3D Object Converter | Open Source |
| .KFX | Amazon | eBook-bestanden | Amazon KF10 eBook File | Calibre | Open Source |
| .KGB | Open Source | Gecomprimeerde bestanden | KGB Archive File | KGB Archiver | Open Source |
| .KHF | Open Source | Gegevensbestanden | Kwalitan Data File | Kwalitan | Open Source |
| .KHS | Open Source | Allerlei bestanden | Kwalitan History Data File | Kwalitan | Open Source |
| .KIWI | Open Source | Gegevensbestanden | KiwiViewer Scene | KiwiViewer | Open Source |
| .KIX | Ruud Van Velsen | Uitvoerbare bestanden | KiXtart Script File | PSPad | Open Source |
| .KMAP | Open Source | Allerlei bestanden | LyX Keymap | Lyx | Open Source |
| .KMD | Open Source | Uitvoerbare bestanden | ABSTAT For Windows Batch File | ABstat | Open Source |
| .KMF | Open Source | Gegevensbestanden | Kwalitan Memo File | Kwalitan | Open Source |
| .KML | Keyhole Corporation | GIS-bestanden | Keyhole Markup Language File | Blender (With Google Earth Importer Plugin) | Open Source |
| .KMY | Open Source | Gegevensbestanden | KMyMoney Data File | KMyMoney | Open Source |
| .KMZ | Google | GIS-bestanden | Google Earth Placemark File | Blender (With Google Earth Importer Plugin) | Open Source |
| .KO | Open Source | Systeembestanden | Linux Kernel Module File | Linux | Open Source |
| .KOC | Open Source | Gegevensbestanden | Koha Offline Circulation Data | Koha | Open Source |
| .KOR | Epic Games | Spelbestanden | Unreal Engine Language Localization | PSPad | Open Source |
| .KPR | Open Source | Gegevensbestanden | KPresenter Presentation | KOffice | Open Source |
| .KPT | Open Source | Tekstbestanden | KPresenter Template File | KOffice | Open Source |
| .KRA | Open Source | Grafische Bestanden | Krita Image | Krita | Open Source |
| .KRF | SPARTA, Inc. | Gegevensbestanden | DNSSEC-Tools Keyrec Data File | KMESS (Kevin's Mesh Efficiency Simulator Software) | Open Source |
| .KS | Debian | Systeembestanden | Kickstart File | KeyStore Explorer | Open Source |
| .KSG | Open Source | 3D-bestanden | Kwalitan Segment File | Kwalitan | Open Source |
| .KSH | AT&T Labs | Uitvoerbare bestanden | Unix Korn Shell Script | AbiWord | Open Source |
| .KSM | Pfaff | Gegevensbestanden | Pfaff Embroidery Design File Format | Embroidermodder 2 | Open Source |
| .KTE | Open Source | Gegevensbestanden | Kite Design File | FoilMaker | Open Source |
| .KTX | Open Source | Gegevensbestanden | Kwalitan Data File | Kwalitan | Open Source |
| .KU | Open Source | Gegevensbestanden | Knowledge Explorer Knowledge Representation Knowledge Unit | my Knowledge Explorer | Open Source |
| .KVA | Open Source | Gecomprimeerde bestanden | KVIrc Compressed Archive | KVIrc | Open Source |
| .KVC | Open Source | Gegevensbestanden | KVC | KVIrc | Open Source |
| .KVS | Open Source | Ontwikkelaarsbestanden | KVIrc Script | KVIrc | Open Source |
| .KVT | Open Source | Instellingsbestanden | KVIrc Heme | KVIrc | Open Source |
| .KWB | Open Source | Gegevensbestanden | Kwalitan Work File | Kwalitan | Open Source |
| .KWD | KDE | Tekstbestanden | KWord Document | KOffice | Open Source |
| .KWT | Open Source | Instellingsbestanden | KVIrc Theme | KVIrc | Open Source |
| .L | Johan Bontes | Gegevensbestanden | Game Of Life File | ModPlug Player | Open Source |
| .LA | Open Source | Audiobestanden | Lossless Audio File | XMMS | Open Source |
| .LAB | Corel | Pagina-indelingsbestand | WordPerfect Label Definition File | BibExcel | Open Source |
| .LAP | Don Ho | Allerlei bestanden | Scheme Source Code | PSPad | Open Source |
| .LAY | Tecplot, Inc | Gegevensbestanden | Tecplot Layout File | MAME | Open Source |
| .LAZ | Global Heavy Industries | Gegevensbestanden | LiquidApps Project File | LASzip | Open Source |
| .LDF | Microsoft Corporation | Gegevensbestanden | SQL Server Transaction Log File | gVim | Open Source |
| .LDS | GNU Project | Ontwikkelaarsbestanden | Binutils LD Linker Script | gVim | Open Source |
| .LGL | Open Source | Spelbestanden | LeechGet Download List | LeechGet | Open Source |
| .LINUX | Open Source | Gegevensbestanden | Linux Data File | Linux | Open Source |
| .LIS | SourceForge | Tekstbestanden | SQR (Structured Query Reporting) Output File | Notepad2 | Open Source |
| .LIST | Open Source | Gegevensbestanden | APT List File | Advanced Package Tool (APT) | Open Source |
| .LIT | Microsoft Corporation | eBook-bestanden | Microsoft Reader eBook File | Calibre | Open Source |
| .LMH | Open Source | Gegevensbestanden | Memory Hacking Software Memory File | Memory Hacking Software | Open Source |
| .LMP | id Software | Spelbestanden | Quake Engine Lump File | Nazi Zombies Portable | Open Source |
| .LNF | Open Source | Gegevensbestanden | Oyoaha Lookandfeel Interface Elements File | oyoaha lookandfeel | Open Source |
| .LNG | Nullsoft | Plug-inbestanden | Winamp Language File | MAME | Open Source |
| .LNGX | Dominik Reichl | Gegevensbestanden | KeePaas Language Data | KeePass Password Safe | Open Source |
| .LNK | Microsoft Corporation | Systeembestanden | Windows File Shortcut | HxD | Open Source |
| .LNT | Gimpel Software | Ontwikkelaarsbestanden | PC-lint/FlexeLint Configuration File | MacVim | Open Source |
| .LNX | Commodore International | Gecomprimeerde bestanden | Commodore 64 Lynx Archive | VICE | Open Source |
| .LOF | Open Source | Audiobestanden | Audacity File List | Audacity | Open Source |
| .LOL | Apple | Ontwikkelaarsbestanden | LOLCODE Source Code FIle | AbiWord | Open Source |
| .LPI | Unknown Developer | Gegevensbestanden | Laser Printer Information | Lazarus IDE | Open Source |
| .LPK | ESRI | GIS-bestanden | ArcGIS Layer Package | Lazarus IDE | Open Source |
| .LPS | DAZ 3D | 3D-bestanden | Bryce Leaf Shape File | Lazarus IDE | Open Source |
| .LPT | Interscape | Gegevensbestanden | LogPlot Compiled Boring Log File | TOPS-10 | Open Source |
| .LQF | Open Source | Gegevensbestanden | LeechFTP Saved Queue | LeechFTP | Open Source |
| .LRC | Various Developers | Allerlei bestanden | Lyrics File | StepMania | Open Source |
| .LRF | Aequus Gaming LTD | Spelbestanden | League Of Legends Replay File | Calibre | Open Source |
| .LRS | Open Source | eBook-bestanden | Librie Reader Source File | Calibre | Open Source |
| .LRT | Aequus Gaming LTD | Spelbestanden | League Of Legends Replay File | YACC | Open Source |
| .LRV | Konica Minolta | Gegevensbestanden | Konica Minolta Data Management Software Stored File | Media Player Classic | Open Source |
| .LRX | Sony | eBook-bestanden | Sony Portable Reader File | Calibre | Open Source |
| .LRZ | Open Source | Gecomprimeerde bestanden | Lrzip Compressed Archive | Lrzip | Open Source |
| .LSP | Open Source | Ontwikkelaarsbestanden | Lisp Program Source Code File | Clozure CL | Open Source |
| .LST | Unknown Developer | Tekstbestanden | Data List | AbiWord | Open Source |
| .LTT | Hewlett-Packard | Gegevensbestanden | HP Library And Tape Tools Log | PSPad | Open Source |
| .LTX | GSC Game World | Spelbestanden | S.T.A.L.K.E.R. Properties File | TEXnicCenter | Open Source |
| .LUG | Unknown Developer | Spelbestanden | Game Data | Dragon UnPACKer | Open Source |
| .LVT | Open Source | Instellingsbestanden | Land Surface Verification Toolkit Configuration | Land Information System Verification Toolkit (LVT) | Open Source |
| .LVZ | Open Source | Spelbestanden | Continuum Zone Data Graphics | Subspace Continuum | Open Source |
| .LXK | Open Source | Gegevensbestanden | Lexicon Link-up File | COREX | Open Source |
| .LYT | Adminsoft | Gegevensbestanden | Adminsoft Document Layout File | AbiWord | Open Source |
| .LYX | Open Source | Gegevensbestanden | XWE File | XWE | Open Source |
| .LZM | Open Source | Gecomprimeerde bestanden | Slax Module | Slax | Open Source |
| .LZMA | Igor Pavlov | Gecomprimeerde bestanden | LZMA Compressed File | PeaZip | Open Source |
| .LZO | Open Source | Gecomprimeerde bestanden | LZO Compressed File | lzop | Open Source |
| .LZS | Open Source | Gecomprimeerde bestanden | LARC Compressed File Archive | ZipZag | Open Source |
| .LZX | Open Source | Gecomprimeerde bestanden | Amiga LZX Compressed File | cabextract | Open Source |
| .M | MathWorks | Ontwikkelaarsbestanden | MATLAB Source Code File | gVim | Open Source |
| .M15 | Moving Picture Experts Group | Videobestanden | MPEG Video File | CocoModX | Open Source |
| .M1A | Open Source | Audiobestanden | MPEG-1 Audio File | Media Player Classic | Open Source |
| .M1V | Roxio | Videobestanden | MPEG-1 Video File | Eltima Elmedia Player | Open Source |
| .M2A | Unknown Developer | Videobestanden | MPEG-1 Layer 2 Audio File | Media Player Classic | Open Source |
| .M2P | Moving Picture Experts Group | Videobestanden | MPEG-2 Program Stream File | Media Player Classic | Open Source |
| .M2T | Roxio | Videobestanden | HDV Video File | Squared 5 MPEG Streamclip | Open Source |
| .M3 | Blizzard Entertainment Inc. | 3D-bestanden | Blizzard MDX3 Model File | m3_Viewer | Open Source |
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