Computer file extensions
Quick links
Extension ABCs
Listing of extensions
Technical Support
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 file 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.
# | 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
| Reference | Questions |
|---|---|
| Extension | Our dictionary definition on file extensions and related links. |
| CH000043 | How to create file extensions longer than three characters. |
| CH000126 | All Windows .exe files have changed association. |
| CH000128 | In Windows when clicking a program get 'Open With Prompt'. |
| CH000209 | Information on long file names. |
| CH000428 | Changing a file extension. |
| CH000429 | Viewing the contents of a file. |
| CH000430 | Cyclic Redundancy Check or CRC error. |
| CH000516 | How do I view hidden files in Windows? |
| CH000572 | How to associate a file with a program in Windows. |
| CH000573 | How to view a computers file extension. |
| Forum | If your question is not listed on this page, try our online forum. |