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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The 'a.out' file extension, short for "assembler output," historically represents an executable file format primarily used in Unix-lik…
An A51 file is a source code file written in assembly language specifically for the Intel 8051 microcontroller architecture. This arch…
The AAB (Android App Bundle) is a publishing format for Android applications. It's not directly installable on a device like an APK. I…
Advanced Audio Coding (AAC) is a standardized, lossy audio compression and encoding scheme for digital audio. Designed to be the succe…
The Advanced Authoring Format (AAF) is a professional-level, cross-platform file format designed for the interchange of digital media…
Augmented Backus-Naur Form (ABNF) is a formal grammar notation used extensively in Internet engineering to define the syntax of protoc…
The .accdb file extension is the default file format for databases created with Microsoft Access, a relational database management sys…
The ACIS file format, identified by the '.acis' or '.sat' (Standard ACIS Text) extension, is a geometric modeling kernel developed by…
The .sat file extension is associated with ACIS, a geometric modeling kernel developed by Spatial Corporation (now part of Dassault Sy…
The ACIS (.sat, .sab) file format is a geometric modeling kernel developed by Spatial Corporation (now part of Dassault Systèmes). It…
ActiveX controls are small programs, also known as add-ons, that are used on the Internet to provide interactive content for web pages…
An OCX file is a type of file used by Microsoft Windows operating systems. OCX stands for OLE Control Extension, where OLE stands for…
The ADG file format is a proprietary file type developed by Ableton for use within their digital audio workstation, Ableton Live. It s…
An ADM file is a Group Policy Administrative Template used by Microsoft Windows operating systems to define registry-based policy sett…
The ADML file format is a language-specific resource file used in conjunction with ADMX (Administrative Template) files within the Mic…
The ADMX file extension represents a Group Policy Administrative Template file used by Microsoft Windows operating systems. Introduced…
The ADX file format is a proprietary lossy audio compression format developed by CRI Middleware. It is primarily used in video games…
An AEP file stands for Adobe After Effects Project file. It is the native project file format used by Adobe After Effects, a professio…
The .ai file extension is primarily associated with Adobe Illustrator, a professional vector graphics editor. AI files store vector-ba…
The Audio Interchange File Format (AIFF) is an audio file format standard used for storing sound data for personal computers and other…
The .air file extension is primarily associated with the Adobe Integrated Runtime (AIR), a cross-platform runtime system originally de…
The ALAC (Apple Lossless Audio Codec) file format is a lossless audio compression format developed by Apple Inc. It's designed to redu…
An ALS file is a project file created by Ableton Live, a professional digital audio workstation (DAW) widely used for music production…
An AMC (Acclaim Motion Capture) file is a specialized data file format used to store 3D motion capture animation data. Originally deve…
The 'a.out' file extension, short for "assembler output," historically represents an executable file format primarily used in Unix-like operating systems. Whil…
An A51 file is a source code file written in assembly language specifically for the Intel 8051 microcontroller architecture. This architecture is a staple in t…
The AAB (Android App Bundle) is a publishing format for Android applications. It's not directly installable on a device like an APK. Instead, it's a container…
Advanced Audio Coding (AAC) is a standardized, lossy audio compression and encoding scheme for digital audio. Designed to be the successor to MP3, AAC generall…
The Advanced Authoring Format (AAF) is a professional-level, cross-platform file format designed for the interchange of digital media, metadata, and compositio…
Augmented Backus-Naur Form (ABNF) is a formal grammar notation used extensively in Internet engineering to define the syntax of protocols and data formats. Sta…
The .accdb file extension is the default file format for databases created with Microsoft Access, a relational database management system (RDBMS) from Microsof…
The ACIS file format, identified by the '.acis' or '.sat' (Standard ACIS Text) extension, is a geometric modeling kernel developed by Spatial Corporation (now…
The .sat file extension is associated with ACIS, a geometric modeling kernel developed by Spatial Corporation (now part of Dassault Systèmes). SAT files store…
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…
ActiveX controls are small programs, also known as add-ons, that are used on the Internet to provide interactive content for web pages. They are based on Micro…
An OCX file is a type of file used by Microsoft Windows operating systems. OCX stands for OLE Control Extension, where OLE stands for Object Linking and Embedd…
The ADG file format is a proprietary file type developed by Ableton for use within their digital audio workstation, Ableton Live. It stands for 'Ableton Device…
An ADM file is a Group Policy Administrative Template used by Microsoft Windows operating systems to define registry-based policy settings. These files contain…
The ADML file format is a language-specific resource file used in conjunction with ADMX (Administrative Template) files within the Microsoft Windows Group Poli…
The ADMX file extension represents a Group Policy Administrative Template file used by Microsoft Windows operating systems. Introduced in Windows Vista and Win…
The ADX file format is a proprietary lossy audio compression format developed by CRI Middleware. It is primarily used in video games, particularly those develo…
An AEP file stands for Adobe After Effects Project file. It is the native project file format used by Adobe After Effects, a professional digital visual effect…
The .ai file extension is primarily associated with Adobe Illustrator, a professional vector graphics editor. AI files store vector-based images, meaning they…
The Audio Interchange File Format (AIFF) is an audio file format standard used for storing sound data for personal computers and other electronic audio devices…
The .air file extension is primarily associated with the Adobe Integrated Runtime (AIR), a cross-platform runtime system originally developed by Adobe Systems…
The ALAC (Apple Lossless Audio Codec) file format is a lossless audio compression format developed by Apple Inc. It's designed to reduce the file size of audio…
An ALS file is a project file created by Ableton Live, a professional digital audio workstation (DAW) widely used for music production, sound design, and live…
An AMC (Acclaim Motion Capture) file is a specialized data file format used to store 3D motion capture animation data. Originally developed by Acclaim Entertai…
Everything you need to know about file extensions