File Extensions

What is a File Extension?

A File extension, also called a filename extension is usually 3 or more characters at the end of the computer file name. File extensions are useful for Windows or MAC OS, which can tell them what kind of data file it is and with which application associated it is. For example, HTML documents are identified by names that end with .htm (or .html), and GIF images by .gif may associated with photoshop.

There are over tens of thousands of file extensions at present, and it is not possible to know them all, when you met a unknown file type and you want to know what is and need open it, search the file name first, then choose the correct program to open it on your computer.

File Extensions Reference

Complete common file extensions list includes most searched and viewed file formats such as mp3 audio files, mkv video files and jpg image files will help you quickly find the file extensions and choose the correct program to open any file extension on your computer.

Welcome to file extension library

File extension library is a collection with over 85,000 file formats, and the database is growing each day. Huge file extensions with detailed information, programs associated to them and software which can open them on different operating system like Windows, Mac and Linux. Related file extensions and recommend converter and player software especially for each audio and video file type.

If you meet an unknown file extension

Find the info on common file extensions first, if there just what you are looking for, click to view the detailed information, if there weren't find, simply use the search box on the top of the pag, enter the file format into the search box and click on the search button. find the file extension shown on the results page, then click to view he detailed information.

If you can't open a file extension

Find the detailed information page with the guide above, then you will find the recommend software for Windows, Mac and Linux, choose the correct program to open it on your computer.

If you can't find a file extension in library

Find there is no info shown on the results page, may be the file extension don't have in database, don't worry, you can ask a question on the answers section, and you will get the free answers from expert quickly.