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extension

(1) See domain extension. (2) A software add-on. For example, see Firefox extension. (3) Prior to Mac OS X, an executable module that enhanced the Mac operating system. The Windows counterpart...

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Definition: extension

(1) See domain extension.

(2) A software add-on. For example, see Firefox extension.

(3) Prior to Mac OS X, an executable module that enhanced the Mac operating system. The Windows counterpart is a "dynamic link library" (see DLL).

(4) A file type that is appended to the end of a file name. All executable programs in the Windows and Mac worlds use extensions: .EXE in Windows; .APP in Mac (see APP file). In the Unix/Linux environment, executables do not use an extension.

No matter which environment, data files have extensions; for example, a file with a .DOC extension is a Microsoft Word document. A file with a .JPG extension is a JPEG image.

Prior to Windows 95, Windows extensions had no more than three letters or digits. Starting with Windows 95, extensions could be considerably longer, but in practice are generally limited to only a few characters.

Common Extensions and Exhaustive Lists
In this encyclopedia, more than 500 common file extensions are listed under the terms "extension," followed by their first letter such as extension a, extension b and extension c. However, there are Web sites that catalog many more, including the most obscure; for example, visit www.filext.com. See Win Show file extensions, dangerous extensions and graphics formats. See also domain extension.



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  • Malicious Chrome extensions hijack Facebook accounts

    Cybercriminals are pushing malicious Google Chrome extensions that hijack Facebook accounts. To make matters worse, the extensions are being hosted on Google's official Chrome Web Store.

    Blog posts | March 26, 2012 9:05pm PDT

  • Google goes indoors for Street View extension

    Google's Street View service is heading indoors, collecting images of businesses and other public spaces, in a further bid to 'map the world'.

    Blog posts | October 30, 2011 4:52pm PDT

  • 5 seriously useful Chrome extensions (photos)

    There's one major element that sets browsers like Google Chrome apart from Safari and Internet Explorer--add-ons. Check out our top five Chrome extensions for the seriously efficient types.

    Image galleries | July 29, 2011 3:00pm PDT

  • Chrome extension adds your Facebook, Twitter streams into Google+

    Start G+ is a Google Chrome extension that lets you easily import your photos from Facebook, as well as post to Facebook and Twitter within Google+. It also adds a Gmail notification icon.

    Blog posts | July 18, 2011 9:48pm PDT

  • Facebook blocks Google Chrome extension for exporting friends

    Facebook is throttling a Chrome extension that lets you export your Facebook friends so you can import them elsewhere, like to Google+.

    Blog posts | July 5, 2011 12:11am PDT

  • Google Releases A Web Spam Reporting Extension For Google Chrome, But Why Only For Chrome?

    Web spam is a formidable adversary. But with the release of the Google Webspam Report extension for Google Chrome, Google is empowering end-users to fight back! But why only release this...

    Blog posts | October 25, 2010 7:32am PDT

  • Download ZDNet's Google Chrome extension

    If you're a Google Chrome user, download the official ZDNet extension. It's free and gives you one-click access to the 10 newest stories.

    Blog posts | October 13, 2010 2:20pm PDT

  • Apple releases Safari 5.0 update; includes Extensions Gallery

    Apple has just published the latest upgrade to Safari, version 5.0.1, which includes a whole new feature called "Extensions Gallery," as well as a number of other interesting fixes.

    Blog posts | July 28, 2010 6:06am PDT

  • Safari 5.0 extensions on parade

    One of the major features of Safari 5.0 is extensions. Apple promised developers a Safari Extensions Gallery page on Apple.com and recently began accepting submissions. In the meantime, several...

    Blog posts | July 25, 2010 11:18pm PDT

  • Chrome extension sync makes unsteady debut

    The long-sought-after browser feature to synchronize extensions across multiple computers arrived on Thursday in the developer's builds of Google Chrome.

    News items | June 18, 2010 4:24am PDT

  • How did Congress pass extension of U.S. Patriot Act? Ask your doctor

    Last Thursday, Congress passed a bill (315-97) without much fanfare, and without any revisions, that extends highly criticized portions of the U.S. Patriot Act, which many have argued is riddled...

    Blog posts | March 2, 2010 8:42am PST

  • Firefox 3.6 upgrade or not?

    My most used extensions won't work with Firefox 3.6. No upgrade for me.

    Blog posts | January 22, 2010 2:57am PST

  • Chrome for Mac to get extensions by "week's end"

    Over 500 extensions are currently available for Google Chrome and they'll be coming the Mac version of Chrome by "week's end."

    Blog posts | December 10, 2009 10:26am PST

  • Microsoft sneaks in Firefox extension via Update

    The good news is that Microsoft is writing extensions for Firefox. The bad news is, the Redmond giant is slipping the extension onto systems without notifying users and making it difficult to get...

    Blog posts | May 31, 2009 6:42pm PDT

  • Google Chrome and the extension conundrum

    Google appears to be on the extension bandwagon for its Chrome browser, but that also opens a Pandora's box. In an extensions document (via Stephen Shankland and Aaron Boodman) Google outlines...

    Blog posts | December 2, 2008 5:06am PST

  • Google outlines plan for extensions in Chrome

    One of the features that is noticeably missing from the current version of Google Chrome is what Firefox calls "Add-ons". These programs are written by developers looking to add functionality to...

    Blog posts | December 1, 2008 4:14pm PST

  • Is it wise to loosen Entourage's attachment security policy?

    Entourage 2008 is very strict in its blocking of attachments and some users may find its security rules restrictive. However, with a bit of effort, users can tell Entourage to loosen up on various...

    Blog posts | April 22, 2008 3:22pm PDT

  • Image: Innertube online

    Innertube, an online extension of CBS television, will have its own original programming in addition to prime-time encores.

    Image galleries | July 20, 2006 3:58pm PDT

  • 30-day extension for VoIP customers

    The FCC has granted a 30-day extension to VoIP providers to obtain acknowledgements from customers that they may have trouble reaching 911 via the Internet.

    Blog posts | August 26, 2005 3:16pm PDT

Additional Results

  • Rogue Firefox extension hijacks browser sessions

    Security researchers from StopMalvertising have spotted a rogue Firefox extension, capable of hijacking browser sessions and posting content on Facebook.

    Blog posts | May 3, 2012 11:06am PDT

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