Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.
Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.
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Notation3 (N3) is a shorthand non-XML serialization of Resource Description Framework (RDF) models, designed with human-readability in…
The .nasm file extension is primarily associated with the Netwide Assembler (NASM), which is an 80x86 and x86-64 assembler designed fo…
An NDF file is a secondary data file used by Microsoft SQL Server. SQL Server databases are typically stored across multiple files for…
The NDX file extension is a generic index file format used by a wide variety of software applications to store pointers, references, o…
NEF is a RAW image format used by Nikon digital cameras. It contains minimally processed data from the camera's image sensor, preservi…
The NES file format, typically with the '.nes' extension, is a ROM image containing the program code and data for a Nintendo Entertain…
A .dll (Dynamic Link Library) file is a library that contains code and data that can be used by more than one program at the same time…
A .NET Assembly file, typically with the extension '.dll' (Dynamic Link Library) or '.exe' (Executable), is a compiled unit of code wr…
NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support th…
A .netmodule file is a .NET Framework assembly that does not contain an assembly manifest. It's essentially a compiled code module, si…
An NFC file is a ROM (Read-Only Memory) image of a game cartridge for the Nintendo Family Computer (Famicom), the Japanese version of…
A NIB file is a resource file used in macOS and iOS development to store user interface designs. The acronym stands for NeXT Interface…
A Ninja build file is a configuration file used by the Ninja build system, a small and incredibly fast build tool designed to focus on…
Nunjucks is a powerful templating engine for JavaScript, heavily inspired by Jinja2 (Python). Files with the `.njk` extension are Nunj…
An NKB file is a specialized data format used by Native Instruments Kontakt, which is one of the industry-standard software samplers f…
An NKI file is a proprietary file format developed by Native Instruments for use with their Kontakt software sampler. It serves as a p…
The .nkm file extension is a proprietary format developed by Native Instruments for use with its Kontakt software sampler, which is a…
The NKSF (Native Kontrol Standard Format) is a proprietary file format developed by Native Instruments to facilitate deep integration…
The 'nksn' file extension does not correspond to a widely recognized or standard file format in public databases or common software ap…
The NOS file extension is primarily associated with Nokia Operator Settings. These files were historically used by Nokia mobile device…
An .npmignore file is a configuration file used by the Node Package Manager (npm) in the Node.js development ecosystem. Its primary pu…
A Nuendo Project File (.npr) is the primary project format used by Steinberg Nuendo, a high-end digital audio workstation (DAW) design…
An NRG file is a proprietary disc image format created by Nero AG, primarily used with their Nero Burning ROM software. It's essential…
The .numbers file extension is associated with Apple's Numbers application, a spreadsheet program that is part of the iWork suite. Num…
Notation3 (N3) is a shorthand non-XML serialization of Resource Description Framework (RDF) models, designed with human-readability in mind. It is a text-based…
The .nasm file extension is primarily associated with the Netwide Assembler (NASM), which is an 80x86 and x86-64 assembler designed for portability and modular…
An NDF file is a secondary data file used by Microsoft SQL Server. SQL Server databases are typically stored across multiple files for performance and manageme…
The NDX file extension is a generic index file format used by a wide variety of software applications to store pointers, references, or metadata that facilitat…
NEF is a RAW image format used by Nikon digital cameras. It contains minimally processed data from the camera's image sensor, preserving a high level of detail…
The NES file format, typically with the '.nes' extension, is a ROM image containing the program code and data for a Nintendo Entertainment System (NES) game. T…
A .dll (Dynamic Link Library) file is a library that contains code and data that can be used by more than one program at the same time. In the context of .NET…
A .NET Assembly file, typically with the extension '.dll' (Dynamic Link Library) or '.exe' (Executable), is a compiled unit of code written in a .NET language…
NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support the creation, access, and s…
A .netmodule file is a .NET Framework assembly that does not contain an assembly manifest. It's essentially a compiled code module, similar to a DLL (Dynamic L…
An NFC file is a ROM (Read-Only Memory) image of a game cartridge for the Nintendo Family Computer (Famicom), the Japanese version of the Nintendo Entertainmen…
A NIB file is a resource file used in macOS and iOS development to store user interface designs. The acronym stands for NeXT Interface Builder, reflecting its…
A Ninja build file is a configuration file used by the Ninja build system, a small and incredibly fast build tool designed to focus on speed. Unlike more tradi…
Nunjucks is a powerful templating engine for JavaScript, heavily inspired by Jinja2 (Python). Files with the `.njk` extension are Nunjucks template files. Thes…
An NKB file is a specialized data format used by Native Instruments Kontakt, which is one of the industry-standard software samplers for music production and s…
An NKI file is a proprietary file format developed by Native Instruments for use with their Kontakt software sampler. It serves as a preset or 'instrument' fil…
The .nkm file extension is a proprietary format developed by Native Instruments for use with its Kontakt software sampler, which is a standard tool in the prof…
The NKSF (Native Kontrol Standard Format) is a proprietary file format developed by Native Instruments to facilitate deep integration between third-party softw…
The 'nksn' file extension does not correspond to a widely recognized or standard file format in public databases or common software applications. It is highly…
The NOS file extension is primarily associated with Nokia Operator Settings. These files were historically used by Nokia mobile devices to store and transmit c…
An .npmignore file is a configuration file used by the Node Package Manager (npm) in the Node.js development ecosystem. Its primary purpose is to prevent speci…
A Nuendo Project File (.npr) is the primary project format used by Steinberg Nuendo, a high-end digital audio workstation (DAW) designed for professional audio…
An NRG file is a proprietary disc image format created by Nero AG, primarily used with their Nero Burning ROM software. It's essentially a complete copy of a C…
The .numbers file extension is associated with Apple's Numbers application, a spreadsheet program that is part of the iWork suite. Numbers files store tabular…
Everything you need to know about file extensions