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This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.
| | This article needs additional citations for verification .(August 2016) |
This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.
| Ext. | Description | Used by |
|---|---|---|
| M [1] | Mathematica Package File | Mathematica |
| M | MATLAB M-File | MATLAB |
| M | Mercury Source File | Mercury |
| M [2] | Source code | Objective-C |
| M2TS | BDAV MPEG-2 transport stream | |
| M3U | MPEG Audio Layer 3 Uniform Resource Locator playlist | Media players |
| M3U8 | MPEG Audio Layer 3 Uniform Resource Locator playlist, using UTF-8 encoding | Media players |
| M3U | MPEG Audio Layer 3 Uniform Resource Locator playlist | Media players |
| M4A | MPEG-4 Part 14 audio | iTunes Store |
| M4P | DRM-encumbered MPEG-4 Part 14 media | iTunes Store (formerly) |
| M4R | See M4A | Apple iPhone ringtones |
| M4V | MPEG-4 Part 14 video, which may optionally be encumbered by FairPlay DRM | iTunes Store, Handbrake |
| M64 | Mupen64 gameplay recording [3] | Mupen64 |
| MA | Autodesk Maya scene description format. The native format of the Maya modeling, animation, and rendering software. [4] | |
| MAT | MATLAB MAT-files. The native data format of the MATLAB numerical computation software. Stores numerical matrices, Boolean values, or strings. Also stores sparse arrays, nested structures, and more. [5] | MATLAB and Octave |
| MBOX | Unix mailbox format. Holds a collection of email messages. Native archive format of email clients such as Unix mail, Thunderbird, and many others. [6] | |
| MCF [7] | Multimedia Container Format (predecessor of Matroska) | |
| MD [8] | Markdown-formatted text file | Markdown |
| MDB | MDB database file. The native format of the Microsoft Access database application. Used in conjunction with the Access relational database management system and as an exchange format. [9] | Microsoft Access |
| MDF [10] | Master Data File, a Microsoft SQL Server file type | Microsoft SQL Server |
| MDF | Measurement Data Format, a binary file format for vector measurement data [11] | automotive industry, developed by Robert Bosch GmbH |
| MDI | Document save in high-resolution, created by MSOffice to scan documents (OCR) and turn them into a .DOC | Microsoft Office |
| MDG | Digital Geometry (Programmable CAD) file format, developed by DInsight | Digital Geometric Kernel |
| MDL | Model | 3D Design Plus or Simulink |
| MDS | Midi Session | Sound Imp. |
| MEX [12] | MEX file (executable command) | Matlab |
| MGF | Wolfram System MGF bitmap format. Used by the Wolfram System user interface for storing raster images. MGF is an acronym for Mathematica Graphics Format. [13] | |
| MGF [14] | Materials and Geometry Format | |
| MHT | MIME encapsulation of aggregate HTML documents | Web Browsers |
| MID | Standard MIDI file | music synthetizers, Winamp |
| MKA | Matroska audio | |
| MKV | Matroska video | |
| MM [2] | Source code | Objective-C++ |
| MML | MathML mathematical markup language. Used for integrating mathematical formulas in web documents. Rendering of embedded MathML is supported by a number of browsers and browser additions. [15] | |
| MNT | Surface metrology or image analysis document | MountainsMap |
| MO | Modelica models. File format specified by the Modelica Association. [16] | |
| MOBI [17] | eBook | Mobipocket, Kindle |
| MOD | AMPL model file | AMPL |
| MOD | Modula language source | |
| MOD | Modula-2 source code file | Clarion Modula-2 |
| MOD | Tracker file format created for Ultimate Soundtracker for the Amiga | MOD (file format) |
| MOD | MOD is recording format for use in digital tapeless camcorders. | MOD and TOD |
| MODULES | Module | GTK+ |
| MOE | same as Modelica Model .mo. | |
| MOL | MDL Molfile | RasMol |
| MOL2 [18] [19] | Tripos Sybyl MOL2 Format | SYBYL, RasMol |
| MOP | MOPAC input file | MOPAC, RasMol |
| MOV [20] | Animation format (Mac) | QuickTime, AutoCAD AutoFlix |
| MP2 [21] [22] | MPEG audio file | Winamp, xing |
| MP3 [23] [21] | MPEG audio stream, layer 3 | AWAVE, CoolEdit(+PlugIn), Winamp, many others |
| MP4 [24] | multimedia container format, MPEG 4 Part 14 | Winamp |
| MPA | MPEG audio stream, layer 1,2,3 | AWAVE |
| MPC | Musepack audio | |
| MPD | LDraw file (multi-part DAT file) | LDraw |
| MPEG [25] [26] [27] | multimedia containter format, video, audio | MPEG Player, Winamp |
| MPG | see MPEG | |
| MPS | MPS linear programming system format (.mps) [28] Commonly used as input format by LP solvers. MPS is an acronym for Mathematical Programming System. [29] | |
| MSC | management saved console [30] | Microsoft; Microsoft MMC [31] |
| MSAV | Mindustry map file | Mindustry [32] |
| MSCH | Mindustry schematic file | Mindustry [32] |
| MSDL [33] | Manchester Scene Description Language | |
| MSF [34] [35] | Multiple sequence file (Pileup format) | |
| MSI | Windows Installer Package | Microsoft Windows |
| MSO | Microsoft Outlook metadata for a Microsoft Word 2000 email attachment [36] | Microsoft Outlook |
| MSSTYLES | Windows visual style file | Microsoft Windows |
| MSU | Microsoft Update Package | Microsoft Windows |
| MTS | See M2TS | |
| MUP | MUP -- File type used by MindMup to export editable Mind Maps | |
| MM | File type used by FreeMind to export editable Mind Maps | |
| MX | Wolfram Language serialized package format (.mx) [28] Wolfram Language serialized package format. Used for the distribution of Wolfram Language packages. Stores arbitrary Wolfram Language expressions in a serialized format optimized for fast loading. [37] | |
| MXF [38] [39] | Material exchange format (RFC 4539, SMPTE 377M) | |
| MYD | a MyISAM data file in MySQL | MyISAM, MySQL |
| MYI | a MyISAM index file in MySQL | MyISAM, MySQL |
| MR | A Engine Simulator engine save file [40] | Engine Simulator |
| Ext. | Description | Used by |
|---|---|---|
| NB | Wolfram Mathematica Notebook (see Wolfram Language) | Mathematica |
| NC | Binary Data | netCDF software package |
| NC | Instructions for NC (Numerical Control) machine | CAMS |
| NC | Name code program | namec-git/namec software package |
| NCD | NC Drill File (Excellon Format, printed circuit board hole definitions) | Most PCB layout software |
| NDK | NDK seismologic file format. Commonly used for storage and exchange of earthquake data. Stores geographical information and wave measurements for individual seismological events. [41] | |
| NDS | Nintendo DS file. Used for Homebrew and official games. | Nintendo DS Consoles and Emulators |
| NEF [42] | Nikon RAW image format | Nikon cameras |
| NET | Pajek graph data format (.net) [28] Pajek graph language and data format. Commonly used exchange format for graphs. The native format of the Pajek network analysis software. The format name is Slovenian for spider. [43] | Pajek network analysis software |
| NEU | Pro/Engineer neutral file format | PTC Pro/Engineer |
| NEX | NEXUS phylogenetic format (.nex, .nxs) [28] Commonly used for storage and exchange of phylogenetic data. Can store DNA and protein sequences, taxa distances, alignment scores, and phylogenetic trees. [44] | |
| NF | Instructions for NC machine made by TRUMPF | TRUMPF |
| NFO | iNFO for accompanying media files | Kodi, Plex |
| NIM | Nim source code file | Nim |
| NMF | Node Map File | Used by SpicyNodes |
| NOFF | 3D object file format with normals (.noff, .cnoff) [28] NOFF is an acronym derived from Object File Format. Occasionally called CNOFF if color information is present. [45] | |
| NPR | Nuendo Project File | Steinberg Nuendo |
| NRO | Nintendo Switch executable file | |
| NRW [46] | Nikon Coolpix RAW image | Nikon |
| NRX | NetRexx Script File | NetRexx |
| NS1 | NetStumbler file | NetStumbler |
| NSA | media | Nullsoft Streaming Audio |
| NSF | NES sound format file | Transfer of NES music data [47] |
| NSV | media | Nullsoft Streaming Video |
| NUMBERS | Numbers spreadsheet file | Numbers |
| NWD, NWF | Navisworks 3D drawing | Navisworks |
| NXS | Same as NEXUS (.nex, .nxs). See NEX above for more details. NEXUS phylogenetic format (.nex, .nxs) [28] |
| Ext. | Description | Used by |
|---|---|---|
| O | Object file | UNIX - Atari - GCC |
| OBJ | Compiled machine language code | |
| OBJ | Object code | Intel Relocatable Object Module |
| OBJ | Wavefront Object | |
| OBS | Script | ObjectScript |
| OCX | OLE custom control | |
| ODB [48] | Database front end document | OpenDocument, LibreOffice |
| ODF [48] | Formula, mathematical equations | OpenDocument, LibreOffice |
| ODG [48] | Drawings and vector graphics | OpenDocument, LibreOffice, Collabora Online |
| ODP [48] | Presentations | OpenDocument, LibreOffice, Collabora Online |
| ODS [48] | OpenDocument spreadsheet format (.ods) [28] | OpenDocument, LibreOffice, Collabora Online |
| ODT [48] | Text (Word processing) documents | OpenDocument, LibreOffice, Collabora Online |
| OFF | 3D object file format (.off, .coff) [28] OFF is an acronym for Object File Format. Used for storing and exchanging 3D models. [49] | |
| OGA | Audio file in the Ogg container format | libogg |
| OGG | Vorbis audio in the Ogg container format | libogg |
| OGV | Video file in the Ogg container format | libogg |
| OGX | Ogg Multiplex Profile | libogg |
| OPUS | Ogg/Opus audio file | mpv, mplayer, many others (official file format). |
| ORG | Emacs Org mode | Emacs Org mode major mode |
| ORG | Older Origin Project | Origin versions 4 or earlier |
| OSB | Osu! Storyboard | Osu! |
| OSC | OpenStreetMap Changeset | OpenStreetMap |
| OSK | Osu! Skin | Osu! |
| OSM | OpenStreetMap data | OpenStreetMap |
| OSM | OpenStreetMap note | OpenStreetMap |
| OSR | Osu! Replay | Osu! |
| OST | Offline Storage Table | Microsoft e-mail software: Outlook Express, Microsoft Outlook |
| OSU | Osu! Beatmap Info | Osu! |
| OSZ | Osu! Beatmap | Osu! |
| OTB | Over-the-air bitmap graphics | |
| OTF | OpenType font | |
| OTL | The Vim Outliner | A vim plugin |
| OTF [48] | Formula, mathematical equations template | OpenDocument, LibreOffice, Collabora Online |
| OTG [48] | Drawings and vector graphics template | OpenDocument, LibreOffice, Collabora Online |
| OTP [48] | Presentations template | OpenDocument, LibreOffice, Collabora Online |
| OTS [48] | Spreadsheets template | OpenDocument, LibreOffice, Collabora Online |
| OTT [48] | Text (Word processing) documents template | OpenDocument, LibreOffice, Collabora Online |
| OV2 | Overlay file (part of program to be loaded when needed) | TomTom Point of Interest |
| OWL [50] [51] | Web ontology language (OWL) file | Protégé and other ontology editors |
| OXT | OpenOffice.org extension | OpenOffice.org / LibreOffice |
| Ext. | Description | Used by |
|---|---|---|
| P | Database PROGRESS source code | PROGRESS |
| P | PASCAL source code file | |
| P | Parser source code file | |
| P8 | PICO-8 Game File | PICO-8 |
| P10 | Certificate Request | |
| P12 | Personal Information Exchange | "Crypto Shell Extensions" |
| PACK [52] | Pack200 Packed Jar File | |
| PAGES | Pages document file | Pages |
| PAK | Archive | Pak |
| PAL | Paint Shop Pro color palette (JASC format) | PaintShop Pro, XnView |
| PAM | PAM Portable Arbitrary Map graphics format | Netpbm |
| PAPA | Flipline Studio's game backups like JackSmith, Papa's Wingeria verion 1.2+, Papa's Pancakeria version 1.4+ [53] | |
| PAR | Parity Archive | [54] |
| PAR2 | Parity Archive v2 | [55] |
| PARAMS | MXNet net representation format (.json, .params) [28] Underlying format of the MXNet deep learning framework, used by the Wolfram Language. Networks saved as MXNet are stored as two separate file: a .json file specifying the network topology and a .params file specifying the numeric arrays used in the network. [56] | |
| PAS | Pascal language source | Borland Pascal |
| PAX | pax archive file | pax, GNU Tar |
| PBLIB | Power Library | PowerBASIC |
| PBM | ASCII portable bitmap format (.pbm) [28] PBM monochrome raster image format. Member of the Portable family of image formats. Related to PGM and PPM. Native format of the Netpbm graphics software package. [57] | Netpbm graphics software package |
| PBO | A file type used by Bohemia Interactive | Arma 3, PBO Manager |
| PCAP | Network packet capture format (.pcap) [28] [58] | WireShark [59] |
| PCL [60] [61] | HP-PCL graphics data file | HP Printer Command Language |
| PCS | PCSurvey file | PCSurvey by Softart - Land Surveying Software |
| PCX | PC Paintbrush file | PC Paintbrush |
| PDB [62] | debugging data | Microsoft Windows |
| PDB [63] | Molecule (protein data bank) | |
| PDE | Processing source code file | Processing programming language |
| Adobe's Portable Document Format | Adobe Acrobat Reader | |
| PDI | Portable Database Image | |
| PDM | Program | Deskmate |
| PDM | PowerDesigner's physical data model (relational model) file format | PowerDesigner |
| PDM | Visual Basic (VB) Project Information File | Visual Basic |
| PDN | Image file | Paint.NET |
| PDS | PALASM Design Description | |
| PDS | Planetary Data System Format | |
| PEM | A text-based certificate file defined in RFC 1421 through RFC 1424 [64] | Applications that need to use cryptographic certificates, including web-servers |
| pet | package [65] | Puppy Linux |
| PFA | PostScript Font File | |
| PFA | Type 3 font file (unhinted PostScript font) | |
| PFAM | PFAM format [66] | |
| PFB | PostScript font | Adobe Type Manager (ATM) |
| PFC | (Personal Filing Cabinet) contains e-mail, preferences and other personal information | AOL |
| PFM [67] | PostScript Type 1 font metric file | Microsoft Windows, Adobe Acrobat Reader |
| PFM [67] | Windows Type 1 font metric file | |
| PGN [68] | Portable Game Notation -Text specification for Chess game | Most chess playing computer applications |
| PFX | An encrypted certificate file [64] | Applications that need to use cryptographic certificates, including web-servers |
| PHF | Database File | Nuverb Systems Inc: Donarius |
| PHN | Phun scene | Algodoo (previously Phun) |
| PHP | PHP file | |
| PHP3 | PHP 3 file | |
| PHP4 | PHP 4 file | |
| PHR | Phrases | LocoScript |
| PHY | Phylip format [66] | |
| PHZ | Algodoo scene | Algodoo |
| PI2 | Portrait Innovations High Resolution Encrypted Image file | Portrait Innovations Studio2 (proprietary) |
| PIE | GlovePIE script file | GlovePIE |
| PIR | PIR format [66] | |
| PIT | Compressed Mac file archive created by PACKIT | unpackit.zoo |
| PIT | Partition Information Table for Samsung's smartphone with Android | Odin3 |
| PK3 | Quake III engine game data | |
| PKL | Pickle file | Python object serialization |
| PKA | Archive | PKARC |
| PL | Perl source code file | |
| PL | Prolog source code file | |
| PL | IRAF pixel list | IRAF astronomical data format |
| PLI | PL/I source file | PL/I compilers |
| PLR | Terraria player/character file | Terraria |
| PLS | Multimedia Playlist, primarily for streaming | Shoutcast, IceCast, others |
| PM [69] | Perl module | |
| PMA | PMarc Archive | |
| PMP | PenguinMod Project file | PenguinMod's project file |
| PNG | Portable Network Graphics file | Web browsers, image viewing and editing applications |
| POM [70] | Build manager configuration file | Apache Maven POM file |
| PPEG | parsimonious PEG grammar | parsimonious parser generator |
| PPTX | MS Office Open-XML Presentation | Microsoft PowerPoint [71] |
| PPSX | MS Office Open-XML Auto-Play Presentation | Microsoft PowerPoint |
| PRJ | Mkd (Unix command) | Mkd project file to extract documentation |
| PROPERTIES | Configuration file format. Commonly used in Java projects. Associates string keys to string values. [72] | |
| PROTO [73] | Message specification | Google Protocol Buffers |
| PRP | Plasma Registry Page | Plasma (engine) |
| PS | Adobe Postscript file | PostScript |
| PSD [74] | Photoshop native file format | Adobe Photoshop |
| PSDC | Photoshop Cloud Document | Adobe Photoshop |
| PSM1 [75] | Windows Powershell module | Windows Powershell |
| PSPPALETTE [76] | Paint Shop Pro color palette (JASC format) | Paint Shop Pro 8.0 and newer |
| PST | Archive File | Microsoft Outlook |
| PS1 | Windows Powershell script [75] | Windows PowerShell |
| PTF | PlayStation Portable Theme file | PSP Theme settings menu |
| PTF | Pro Tools Session File | Digidesign/Avid Pro Tools version 7 up to version 9 |
| PTS | Pro Tools Session File | Digidesign Pro Tools (legacy version) |
| PTX | Pro Tools Session File | Avid Pro Tools version 10 or later |
| PUB | Public key ring file | Pretty Good Privacy RSA System |
| PUP [34] [35] | Pileup format | |
| PY | Python script file | Python (programming language) |
| Ext. | Description | Used by |
|---|---|---|
| QFX | Quicken-specific implementation of the OFX specification | Intuit Quicken |
| QIF [77] | Quicken Interchange Format | Intuit Quicken |
| QLC [67] | ATM Type 1 fonts script | Adobe Type Manager |
| QOI | Quite OK Image Format | Web browsers, image viewing and editing applications |
| QT | QuickTime movie (animation) | |
| QTVR | QuickTime VR Movie |
|- | QSS |QT Style Sheet |QT Python GUI library
| Ext. | Description | Used by |
|---|---|---|
| R | Ratfor file | Ratfor |
| R | Script file | R |
| R00, R01, ... | Part of a multi-file RAR archive | RAR |
| R2D | Reflex 2 datafile | Reflex 2 |
| R3D | Red Raw Video (raw video data created with a Red camera) | Red Camera |
| R8P | PCL 4 bitmap font file | Intellifont |
| RAD | 2-op FM music | Reality AdLib Tracker |
| RAD | Radiance | Radiance |
| RAL | Remote Access Language file | Remote Access |
| RAM | Ramfile | RealAudio |
| RAP | Flowchart | RAPTOR |
| RAR | Archive | RAR |
| RAS | Graphics format | SUN Raster |
| RB | Ruby Script file | |
| RBXL | Roblox Experience file | Roblox Studio |
| RC | Configuration file | emacs, Vim (text editor), Bash (Unix shell) |
| RC [78] | Resource Compiler script file | Microsoft C/C++, Borland C++ |
| RDP [79] | RDP connection | Remote Desktop connection |
| RDS [80] | Data file | R |
| RES [81] | Compiled resource | Microsoft C/C++, Borland C++ |
| REX, REXX | Rexx Script file | ooRexx |
| RKT | Racket language source file | DrRacket integrated development environment (IDE) for the Racket (programming language) |
| RM [82] | RealMedia | RealPlayer |
| RMD [83] | R Markdown | RStudio |
| RMVB [84] | RealMedia Variable Bitrate | RealPlayer |
| Rob | Robot4 (TM) Input file format | Robot4 software |
| ROL | AdLib Piano Roll | AdLib Visual Composer |
| RPM | RPM software package | Red Hat Linux, the Linux Standard Base and several other operating systems |
| RS | Rust language source | |
| RSA | Harwell–Boeing matrix format. Used for exchanging and storing sparse matrices. [85] | |
| RSL, RSLS, RSLF | Resilio Sync File Placeholder | |
| RST | reStructuredText | Docutils |
| RTF [86] [87] [88] | Rich Text Format text file (help file script) | many - Microsoft Word |
| RUA | same as RSA | |
| RUN | AMPL script file | AMPL |
| RUN | Makeself shell self-extracting archive | shell |
Ogg is a free, open container format maintained by the Xiph.Org Foundation. The authors of the Ogg format state that it is unrestricted by software patents and is designed to provide for efficient streaming and manipulation of high-quality digital multimedia. Its name is derived from "ogging", jargon from the computer game Netrek.
The Rich Text Format is a proprietary document file format with published specification developed by Microsoft Corporation from 1987 until 2008 for cross-platform document interchange with Microsoft products. Prior to 2008, Microsoft published updated specifications for RTF with major revisions of Microsoft Word and Office versions.
Waveform Audio File Format is an audio file format standard for storing an audio bitstream on personal computers. The format was developed and published for the first time in 1991 by IBM and Microsoft. It is the main format used on Microsoft Windows systems for uncompressed audio. The usual bitstream encoding is the linear pulse-code modulation (LPCM) format.
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.
The Internet Calendaring and Scheduling Core Object Specification (iCalendar) is a media type which allows users to store and exchange calendaring and scheduling information such as events, to-dos, journal entries, and free/busy information, and together with its associated standards has been a cornerstone of the standardization and interoperability of digital calendars across different vendors. Files formatted according to the specification usually have an extension of .ics. With supporting software, such as an email reader or calendar application, recipients of an iCalendar data file can respond to the sender easily or counter-propose another meeting date/time. The file format is specified in a proposed Internet standard for calendar data exchange. The standard and file type are sometimes referred to as "iCal", which was the name of the Apple Inc. calendar program until 2012, which provides one of the implementations of the standard.
.doc is a filename extension used for word processing documents stored on Microsoft's proprietary Microsoft Word Binary File Format; it was the primary format for Microsoft Word until the 2007 version replaced it with Office Open XML .docx files. Microsoft has used the extension since 1983.
The Internet Printing Protocol (IPP) is a specialized communication protocol used between client devices and printers. The protocol allows clients to submit one or more print jobs to the network-attached printer or print server, and perform tasks such as querying the status of a printer, obtaining the status of print jobs, or cancelling individual print jobs.
In computing, the Preboot eXecution Environment specification describes a standardized client–server environment that boots a software assembly, retrieved from a network, on PXE-enabled clients. On the client side it requires only a PXE-capable network interface controller (NIC), and uses a small set of industry-standard network protocols such as Dynamic Host Configuration Protocol (DHCP) and Trivial File Transfer Protocol (TFTP).
3GP is a multimedia container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services.
These tables compare features of multimedia container formats, most often used for storing or streaming digital video or digital audio content. To see which multimedia players support which container format, look at comparison of media players.
MPEG-4 Part 14, or MP4, is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. The only filename extension for MPEG-4 Part 14 files as defined by the specification is .mp4. MPEG-4 Part 14 is a standard specified as a part of MPEG-4.
The Microsoft Open Specification Promise is a promise by Microsoft, published in September 2006, to not assert its patents, in certain conditions, against implementations of a certain list of specifications.
The ISO base media file format (ISOBMFF) is a container file format that defines a general structure for files that contain time-based multimedia data such as video and audio. It is standardized in ISO/IEC 14496-12, a.k.a. MPEG-4 Part 12, and was formerly also published as ISO/IEC 15444-12, a.k.a. JPEG 2000 Part 12.
WebSocket is a computer communications protocol, providing a simultaneous two-way communication channel over a single Transmission Control Protocol (TCP) connection. The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011. The current specification allowing web applications to use this protocol is known as WebSockets. It is a living standard maintained by the WHATWG and a successor to The WebSocket API from the W3C.
A uniform resource locator (URL), colloquially known as an address on the Web, is a reference to a resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI), although many people use the two terms interchangeably. URLs occur most commonly to reference web pages (HTTP/HTTPS) but are also used for file transfer (FTP), email (mailto), database access (JDBC), and many other applications.
A well-known URI is a Uniform Resource Identifier for URL path prefixes that start with /.well-known/. They are implemented in webservers so that requests to the servers for well-known services or information are available at URLs consistent well-known locations across servers.
The .m extension originally stood for "messages" when Objective-C was first introduced, referring to a central feature of Objective-C
{{cite web}}: CS1 maint: numeric names: authors list (link)Несколько оснасток могут быть объединены администратором в инструмент (также называется документом), который сохраняется в файле с расширением .msc (Management Saved Console). [Translation: An administrator can gather a few frameworks into an instrument (also known as a document) stored in a file with the suffix .msc (Management Saved Console).]A powerful feature of the MMC [...] enables administrators to create custom tools [...], simply snap in the desired tools, and then the console can be saved as a Management Saved Console (MSC) file [...]
{{cite journal}}: CS1 maint: numeric names: authors list (link)When sending HTML messages with an attached Microsoft Office 2000 document, the message is sent as an Outlook HTML message [...]. The Oledata.mso file contains necessary information to properly render the attachment in the message in its originating program.
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