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.
Refine your search with categories and letters
M4A (MPEG-4 Audio) is a filename extension used to represent audio files encoded with Advanced Audio Coding (AAC) or Apple Lossless Au…
A .snap file is a self-contained package format used primarily in Linux environments for distributing software applications and their…
The `.mjs` file extension is used for ECMAScript JavaScript modules. It signifies that the file should be treated as a module by JavaS…
A CSHTML file is a web page that uses Razor syntax with C# code. It's primarily used in ASP.NET MVC and ASP.NET Core web applications…
Parasolid files (.x_t for text format and .x_b for binary format) are CAD (Computer-Aided Design) files used for storing 3D solid mode…
The BIN/CUE file format is a disc image format commonly used for creating exact copies of CDs and DVDs. The BIN file contains the raw…
A PLS (Playlist) file is a plain text file format used to store a list of audio or video files for playback in media players. It's a s…
A .tgz file is a compressed archive file, essentially a combination of a TAR archive and Gzip compression. First, multiple files and d…
A .BAT file is a batch file containing a series of commands to be executed by the command-line interpreter (usually cmd.exe) in Window…
The .img file extension is primarily associated with ERDAS Imagine, a powerful geospatial data authoring system used for remote sensin…
A DRV file is a device driver file. Device drivers are essential software components that enable the operating system to interact with…
A .SYS file is a system file used by Microsoft Windows and other operating systems. These files typically contain device drivers, hard…
An FTL file is a template file used by FreeMarker, a template engine written in Java. FreeMarker is commonly used to generate text-bas…
TOML is a configuration file format that is easy to read due to its simple syntax. It is designed to be easily parsed into data struct…
A CBR file is a Comic Book Archive file. It's essentially a renamed RAR archive containing a series of image files, typically in JPEG…
The PEF file extension represents a raw image format used by Pentax digital cameras. Raw image formats, like PEF, store the unprocesse…
A VDI file is a Virtual Disk Image file format used by Oracle's VirtualBox virtualization software. It contains the entire contents of…
reStructuredText (RST, ReST, or reST) is a plain text markup syntax similar to Markdown. It is primarily used for technical documentat…
A .prt file is a part file created by Siemens NX (formerly Unigraphics NX), a professional CAD/CAM/CAE software suite. It contains 3D…
An XPI file is a compressed archive used by Mozilla-based applications like Firefox, Thunderbird, and SeaMonkey to distribute and inst…
An OLE Control Extension (OCX) file is a type of dynamic-link library (DLL) used in Microsoft Windows operating systems. OCX files con…
The .gig file format, short for GigaSampler Instrument File, is a proprietary audio sample library format originally developed by Neme…
The 3DM file format is a file extension used by Rhinoceros 3D, a popular NURBS (Non-Uniform Rational B-Splines) modeling software. It…
The ACIS (.sat, .sab) file format is a geometric modeling kernel developed by Spatial Corporation (now part of Dassault Systèmes). It…
M4A (MPEG-4 Audio) is a filename extension used to represent audio files encoded with Advanced Audio Coding (AAC) or Apple Lossless Audio Codec (ALAC). AAC is…
A .snap file is a self-contained package format used primarily in Linux environments for distributing software applications and their dependencies. It's design…
The `.mjs` file extension is used for ECMAScript JavaScript modules. It signifies that the file should be treated as a module by JavaScript runtimes, both in b…
A CSHTML file is a web page that uses Razor syntax with C# code. It's primarily used in ASP.NET MVC and ASP.NET Core web applications. CSHTML files combine HTM…
Parasolid files (.x_t for text format and .x_b for binary format) are CAD (Computer-Aided Design) files used for storing 3D solid models. They are the native f…
The BIN/CUE file format is a disc image format commonly used for creating exact copies of CDs and DVDs. The BIN file contains the raw binary data of the disc…
A PLS (Playlist) file is a plain text file format used to store a list of audio or video files for playback in media players. It's a simple and widely supporte…
A .tgz file is a compressed archive file, essentially a combination of a TAR archive and Gzip compression. First, multiple files and directories are bundled to…
A .BAT file is a batch file containing a series of commands to be executed by the command-line interpreter (usually cmd.exe) in Windows. These files are plain…
The .img file extension is primarily associated with ERDAS Imagine, a powerful geospatial data authoring system used for remote sensing, image processing, and…
A DRV file is a device driver file. Device drivers are essential software components that enable the operating system to interact with hardware devices, such a…
A .SYS file is a system file used by Microsoft Windows and other operating systems. These files typically contain device drivers, hardware configurations, or c…
An FTL file is a template file used by FreeMarker, a template engine written in Java. FreeMarker is commonly used to generate text-based output, such as HTML w…
TOML is a configuration file format that is easy to read due to its simple syntax. It is designed to be easily parsed into data structures. TOML aims to be min…
A CBR file is a Comic Book Archive file. It's essentially a renamed RAR archive containing a series of image files, typically in JPEG, PNG, or GIF format, whic…
The PEF file extension represents a raw image format used by Pentax digital cameras. Raw image formats, like PEF, store the unprocessed data captured by the ca…
A VDI file is a Virtual Disk Image file format used by Oracle's VirtualBox virtualization software. It contains the entire contents of a virtual hard disk, inc…
reStructuredText (RST, ReST, or reST) is a plain text markup syntax similar to Markdown. It is primarily used for technical documentation, software documentati…
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…
An XPI file is a compressed archive used by Mozilla-based applications like Firefox, Thunderbird, and SeaMonkey to distribute and install extensions, themes, a…
An OLE Control Extension (OCX) file is a type of dynamic-link library (DLL) used in Microsoft Windows operating systems. OCX files contain ActiveX controls, wh…
The .gig file format, short for GigaSampler Instrument File, is a proprietary audio sample library format originally developed by Nemesys and later owned by TA…
The 3DM file format is a file extension used by Rhinoceros 3D, a popular NURBS (Non-Uniform Rational B-Splines) modeling software. It is the native file format…
The ACIS (.sat, .sab) file format is a geometric modeling kernel developed by Spatial Corporation (now part of Dassault Systèmes). It's a widely used format f…
Everything you need to know about file extensions