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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Stylus is a preprocessor scripting language that is compiled into Cascading Style Sheets (CSS). It is designed to be a concise, flexib…
An HPP file is a header file specifically associated with the C++ programming language. It serves as a container for declarations of c…
Sass (Syntactically Awesome Style Sheets) is a preprocessor scripting language that is compiled or interpreted into Cascading Style Sh…
An LSP file is a source code file written in the Lisp programming language, which is one of the oldest and most influential high-level…
XHTML (eXtensible HyperText Markup Language) is a markup language that is a reformulation of HTML 4 as an XML application. This means…
A file with the .src extension is a generic source code file containing human-readable instructions written in a programming or script…
A .cpp file is a source code file written in the C++ programming language, which is a high-level, general-purpose language that evolve…
A Unity Package file, typically with the '.unitypackage' extension, is a proprietary archive format used by the Unity game engine. It…
A VCXPROJ file is a project file used by Microsoft Visual Studio to store information and build settings for a C++ programming project…
The VLX file extension is associated with AutoCAD, a professional computer-aided design (CAD) software developed by Autodesk. It repre…
An ASM file is a source code file written in Assembly language, which is a low-level programming language closely related to machine c…
A file with the .hxx extension is a header file used primarily in C++ programming. It typically contains declarations of classes, func…
The .scm file extension is primarily associated with source code files written in the Scheme programming language, which is a minimali…
A .csproj file is a project file used by the Microsoft .NET framework to store information about a C# software project. It is an XML-f…
The .prg file extension is a versatile suffix primarily used to denote program files or source code scripts across several distinct co…
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 file with the .hh extension is a header file specifically used in C++ programming. These files serve as a blueprint for source code…
An INC file is a text-based file used across various programming and scripting languages to store reusable code, declarations, constan…
An A51 file is a source code file written in assembly language specifically for the Intel 8051 microcontroller architecture. This arch…
An ANTLR v4 Grammar file, denoted by the .g4 extension, is a source file used by the ANTLR (Another Tool for Language Recognition) par…
FXML is an XML-based user interface markup language created by Oracle Corporation for defining the user interface of a JavaFX applicat…
Extensible Application Markup Language (XAML) is a declarative XML-based language developed by Microsoft that is used for initializing…
A .cxx file is a source code file written in the C++ programming language. It is one of several common extensions used for C++ source…
A patch file is a specialized text document that contains instructions on how to modify a source code file or a set of files. It is ty…
Stylus is a preprocessor scripting language that is compiled into Cascading Style Sheets (CSS). It is designed to be a concise, flexible, and expressive way to…
An HPP file is a header file specifically associated with the C++ programming language. It serves as a container for declarations of classes, functions, consta…
Sass (Syntactically Awesome Style Sheets) is a preprocessor scripting language that is compiled or interpreted into Cascading Style Sheets (CSS). Sass is a sup…
An LSP file is a source code file written in the Lisp programming language, which is one of the oldest and most influential high-level programming languages in…
XHTML (eXtensible HyperText Markup Language) is a markup language that is a reformulation of HTML 4 as an XML application. This means that XHTML documents must…
A file with the .src extension is a generic source code file containing human-readable instructions written in a programming or scripting language. While many…
A .cpp file is a source code file written in the C++ programming language, which is a high-level, general-purpose language that evolved from the original C lan…
A Unity Package file, typically with the '.unitypackage' extension, is a proprietary archive format used by the Unity game engine. It functions as a standardiz…
A VCXPROJ file is a project file used by Microsoft Visual Studio to store information and build settings for a C++ programming project. Introduced with Visual…
The VLX file extension is associated with AutoCAD, a professional computer-aided design (CAD) software developed by Autodesk. It represents a Compiled Visual L…
An ASM file is a source code file written in Assembly language, which is a low-level programming language closely related to machine code instructions. Unlike…
A file with the .hxx extension is a header file used primarily in C++ programming. It typically contains declarations of classes, functions, variables, and oth…
The .scm file extension is primarily associated with source code files written in the Scheme programming language, which is a minimalist dialect of Lisp. Schem…
A .csproj file is a project file used by the Microsoft .NET framework to store information about a C# software project. It is an XML-formatted text file that a…
The .prg file extension is a versatile suffix primarily used to denote program files or source code scripts across several distinct computing platforms and dev…
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 file with the .hh extension is a header file specifically used in C++ programming. These files serve as a blueprint for source code, containing declarations…
An INC file is a text-based file used across various programming and scripting languages to store reusable code, declarations, constants, or configuration sett…
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…
An ANTLR v4 Grammar file, denoted by the .g4 extension, is a source file used by the ANTLR (Another Tool for Language Recognition) parser generator. ANTLR is a…
FXML is an XML-based user interface markup language created by Oracle Corporation for defining the user interface of a JavaFX application. It provides a sophis…
Extensible Application Markup Language (XAML) is a declarative XML-based language developed by Microsoft that is used for initializing structured values and ob…
A .cxx file is a source code file written in the C++ programming language. It is one of several common extensions used for C++ source files, alongside .cpp and…
A patch file is a specialized text document that contains instructions on how to modify a source code file or a set of files. It is typically generated by a 'd…
Everything you need to know about file extensions