Computer file extensions

Quick links

Extension ABCs
Listing of extensions
Technical Support

Extension ABCs

A computer file extension is commonly a three characters addition that follows the name of a file. This extension helps IBM compatible computers, such as computers running Microsoft Windows, to identify what program to associate the file with and how to properly open the file.

This section of Computer Hope has been designed as a location for users to locate what programs are associated with what file extensions as well as a location to find technical support for questions regarding computer files and/or file extensions.

Listing of extensions

Below is a listing of links to the thousands of file extensions and brief descriptions currently listed on Computer Hope. Click one of the below letters with what the file extension you're looking for begins with. For example, If you're looking for information about a .EXE file click the letter E.