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- What Is .kmz.kmz is a compressed file format that stores Keyhole Markup Language (KML) geographic data, combining XML-based location...
- What Is .laccdbA .laccdb file is a temporary lock file automatically created by Microsoft Access when a database (.mdb or .accdb) is op...
- What Is .lessLESS (Leaner Style Sheets) is a CSS preprocessor created in 2009 by Alexis Sellier that extends CSS with dynamic feature...
- What Is .libThe .lib domain is a generic top-level domain (gTLD) introduced by ICANN in 2015 as part of the New Generic Top-Level Do...
- What Is .live.live is a generic top-level domain (gTLD) introduced by ICANN in 2015, designed for websites emphasizing real-time enga...
- What Is .lnk.lnk is a Windows shortcut file format introduced by Microsoft in Windows 3.1 (1991) that stores metadata about target f...
- What Is .local.local is a special-use top-level domain defined by RFC 6762 in 2013 that enables multicast DNS (mDNS) for automatic dev...
- What Is .log.log files are text-based records that document events, errors, and activities generated by software applications and op...
- What Is .lol.lol is a generic top-level domain (gTLD) approved by ICANN in 2013 and launched in October 2014 for websites focused on...
- What Is .lrc.lrc is a file format for storing synchronized song lyrics with timestamp information, enabling real-time lyric display ...
- What Is .lrfLRF (Literary Rich Format) is Sony's proprietary e-book file format designed for Sony Reader devices and compatible e-re...
- What Is .m2t.m2t is an MPEG-2 Transport Stream file format developed in 1995 as part of the MPEG-2 standard, primarily used for reco...
- What Is .m2ts.m2ts (MPEG-2 Transport Stream) is a high-definition video file format introduced in the early 2000s, primarily used by ...
- What Is .m3u.m3u is a plain text playlist format created in 1997 by Winamp that stores references to audio and video files as local ...
- What Is .m3u8.m3u8 is a Unicode version of the M3U playlist format that contains URLs and metadata for media segments, primarily used...
- What Is .m4a.m4a is a protected audio format developed by Apple using Advanced Audio Coding (AAC) compression, introduced in 2003 as...
- What Is .m4b.m4b is an MPEG-4 audio file format introduced by Apple in 2004, primarily designed for audiobooks with built-in bookmar...
- What Is .m4p.m4p stands for MPEG-4 Audio Protected, a digital audio format developed by Apple in 2003 combining AAC audio codec with...
- What Is .m4v.m4v is a video container format developed by Apple and introduced in 2005 as a specialized implementation of MPEG-4 Par...
- What Is .map.map() is a JavaScript array method introduced in ES5 (2009) that creates a new array by applying a transformation funct...
- What Is .mboxThe .mbox (mailbox) format is a text-based file format for storing email messages, originally developed for Unix systems...
- What Is .mdb.mdb is a proprietary database file format developed by Microsoft for Access databases, introduced in 1996 with Access 9...
- What Is .mdc.mdc is a file extension that can represent multiple file types depending on context: Multi-Dimension Cube files used by...
- What Is .mde.mde files are compiled Microsoft Access database files from Access versions 97-2003 that cannot be edited, only execute...
- What Is .mdi.mdi is the Microsoft Document Imaging format, a file extension created by Microsoft for storing scanned documents and i...
- What Is .mdsAn MDS file is a Media Descriptor File that serves as a metadata companion to MDF disc image files, containing informati...
- What Is .me.uk.me.uk is a second-level domain under the .uk Top Level Domain managed by Nominet UK, specifically designed for natural ...
- What Is .med.med is a sponsored top-level domain (sTLD) launched on December 3, 2015, specifically designed for medical professional...
- What Is .mef.mef can refer to multiple file formats depending on context: the Multiscale Electrophysiology Format for storing large-...
- What Is .mhtmlMHTML (MIME encapsulation of aggregate HTML documents) is a web archiving file format that combines HTML code with all l...
- What Is .midA .mid file is a MIDI (Musical Instrument Digital Interface) file that stores digital music data in a standardized forma...
- What Is .midiMIDI (Musical Instrument Digital Interface) is a standardized protocol created in 1983 that enables musical instruments,...
- What Is .mil.mil is a sponsored top-level domain exclusively reserved for the United States military and Department of Defense, esta...
- What Is .mmap.mmap (memory-mapped file) is a computing technique that maps a file or portion of a file into a process's virtual addre...
- What Is .mobi.mobi is a specialized top-level domain (TLD) launched on July 11, 2005, designed exclusively for mobile devices and app...
- What Is .moeThe <strong>.moe</strong> domain is a specialized top-level domain (TLD) introduced in 2013 that caters to the anime and...
- What Is .monster.monster is a generic top-level domain (gTLD) introduced by ICANN in 2014 that allows websites to use .monster instead o...
- What Is .mov fileA .mov file is a multimedia container format developed by Apple in 1998 as part of the QuickTime framework, capable of s...
- What Is .mp3 fileAn MP3 file is a compressed audio format that uses lossy compression to significantly reduce file size while maintaining...
- What Is .mppA .mpp file is Microsoft Project Plan, the native binary file format used by Microsoft Project software to store compreh...
- What Is .mscx.mscx is a compressed XML file format used by MuseScore, a free, open-source music notation software available across Wi...
- What Is .mscz.mscz is a compressed file format used by MuseScore, a free, open-source music notation software. It stores sheet music ...
- What Is .msf.msf files are message summary cache files used primarily by Mozilla Thunderbird email client to store metadata and mess...
- What Is .msix.msix is a modern Windows application package format introduced by Microsoft around 2018 as a successor to traditional M...
- What Is .msp.msp is a Microsoft patch file format used with Windows Installer (MSI) packages to distribute software updates and patc...
- What Is .mst.mst files are Microsoft Installer Transform files that modify Windows installer packages (.msi files) for customized de...
- What Is .mts.mts is a file extension for MPEG-2 Transport Stream video files, primarily used by digital cameras and camcorders from ...
- What Is .muiMUI (Material-UI) is an open-source React component library that implements Google's Material Design, providing pre-buil...
- What Is .mxfMXF (Material eXchange Format) is a standardized professional file format developed by SMPTE in 2004 for storing and exc...
- What Is .mxl.mxl is a compressed XML-based file format used for storing musical scores and notation. Developed as an extension of Mu...