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File Extensions

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.

9
Indexed file extensions

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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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9 extensions
Data Letter: N Clear all
.N3

Notation3 RDF Document

Notation3 (N3) is a shorthand non-XML serialization of Resource Description Framework (RDF) models, designed with human-readability in…

Data
.NDF

SQL Server Secondary Data File

An NDF file is a secondary data file used by Microsoft SQL Server. SQL Server databases are typically stored across multiple files for…

Data
.NDX

Index File

The NDX file extension is a generic index file format used by a wide variety of software applications to store pointers, references, o…

Data
.NETCDF

Network Common Data Form

NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support th…

Data
.NFC

Nintendo Family Computer ROM

An NFC file is a ROM (Read-Only Memory) image of a game cartridge for the Nintendo Family Computer (Famicom), the Japanese version of…

Data
.NKSN

Unrecognized File Format

The 'nksn' file extension does not correspond to a widely recognized or standard file format in public databases or common software ap…

Data
.NOS

Nokia Operator Settings File

The NOS file extension is primarily associated with Nokia Operator Settings. These files were historically used by Nokia mobile device…

Data
.NUMBERS

Numbers Spreadsheet

The .numbers file extension is associated with Apple's Numbers application, a spreadsheet program that is part of the iWork suite. Num…

Data
.NX PART (.PRT)

NX Part File (.prt)

A .prt file is a part file created by Siemens NX (formerly Unigraphics NX), a professional CAD/CAM/CAE software suite. It contains 3D…

Data
.N3

Notation3 RDF Document

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…

Data
.NDF

SQL Server Secondary Data File

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…

Data
.NDX

Index File

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…

Data
.NETCDF

Network Common Data Form

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…

Data
.NFC

Nintendo Family Computer ROM

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…

Data
.NKSN

Unrecognized File Format

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…

Data
.NOS

Nokia Operator Settings File

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…

Data
.NUMBERS

Numbers Spreadsheet

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…

Data
.NX PART (.PRT)

NX Part File (.prt)

A .prt file is a part file created by Siemens NX (formerly Unigraphics NX), a professional CAD/CAM/CAE software suite. It contains 3D model data representing a…

Data

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.