View all extensions

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.

2
Indexed file extensions
Popular searches:
.DOCX .7Z .AUTOCAD (DWG, DXF) .PDF .TXT .OBJ (.OBJ)

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.

Filter extensions

Refine your search with categories and letters

Filter by category
All categories Archive Audio Data Document Executable Image Programming Video
Filter by letter
All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
2 extensions
Archive Letter: X Clear all
.XAPK

Extended APK

XAPK is a file format used to distribute Android applications, especially those that are large or require additional resources beyond…

Archive
.XPI

Mozilla Extension Package

An XPI file is a compressed archive used by Mozilla-based applications like Firefox, Thunderbird, and SeaMonkey to distribute and inst…

Archive
.XAPK

Extended APK

XAPK is a file format used to distribute Android applications, especially those that are large or require additional resources beyond what a standard APK file…

Archive
.XPI

Mozilla Extension Package

An XPI file is a compressed archive used by Mozilla-based applications like Firefox, Thunderbird, and SeaMonkey to distribute and install extensions, themes, a…

Archive

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.