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Part 4: Appendixes > Common Filename Extensions

Appendix F. Common Filename Extensions

This appendix lists many of the most common filename extensions that you’ll find on your system, that you might download, or have sent to you over the Internet.

Extensions were universally used on DOS and Windows 3.1 files, but Microsoft has gone to some difficulty to hide them in Windows XP. This is unfortunate, since they play a major role in the way Windows decides what application will be used to open a file, as well as which files will be visible when opening files in a given application. While direct associations are made between some files without extensions and the applications needed to open them, in most cases, the association is between an extension and a Registry setting that tells the system what application to use. To enable the display of filename extensions, go to Control Panel [Appearance and Themes] Folder Options View tab, and turn off the “Hide extensions for known file types” option.


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