Computer file extensions and file help

Updated: 10/17/2017 by Computer Hope

.txtA computer file extension is commonly a three character addition that follows the name of a file. A few of the more common file extensions include EXE, DOC or DOCX, XLS, TXT, PDF, and MP3.

Tip: See our list of most common file types and file extensions for a complete list of file extensions broken down to categories.

Complete list of file extensions

Below is an alphabetical list of links to thousands of file extensions and brief descriptions currently listed on Computer Hope. For the file extension you are looking for, click the first letter of the file extension. For example, if you are looking for information about a .EXE file, click the letter E.

# | 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

Computer file and file extension help