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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.

3
Indexed file extensions

Find the right information for any file extension

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.

Search by extension Enter extensions like PDF, APK, DAT, HEIC, ZIP, or DOCX.
Browse categories Filter by documents, images, videos, archives, data, and more.
Open files safely Check file sources and use trusted software before opening unknown files.

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3 extensions
Executable Letter: N Clear all
.NES

Nintendo Entertainment System ROM

The NES file format, typically with the '.nes' extension, is a ROM image containing the program code and data for a Nintendo Entertain…

Executable
.NET ASSEMBLIES (DLL)

.NET Assembly

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…

Executable
.NET ASSEMBLY

.NET Assembly

A .NET Assembly file, typically with the extension '.dll' (Dynamic Link Library) or '.exe' (Executable), is a compiled unit of code wr…

Executable

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.