.ico file extension

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.ico

Microsoft Windows icon image file. An icon is a small image which is used to represent the application. Icons can also be associated with web pages..

favicon.ico: A file used on websites to hold a favourites icon (or favicon), which is the icon displayed in the browser for the webpage. The file name is traditionally favicon.ico, but does not need to have this name.

Relevant links:

www.daubnet.com/en/file-format-ico - File format information for .ico files.
www.irfanview.com - A excellent image manipulation program (freeware) for Windows which can be used to create and edit .ico files.
www.chami.com/html-kit/services/favicon/ - an online tool for converting an image to a favicon.ico file.
www.cryer.co.uk/resources/javascript/html7_add_a_page_icon.htm - How to add a favicon to a web page.
http://icofx.ro/ - Excellent (and free) icon editor.
www.1favicon.com/en/favicon_ico.php - Simple and clear definition of a favicon.

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Can you add to this? Do you know of any applications not already listed which will work with .ico files, view, or open .ico files? Are you able to contribute any additional reference or file format information about .ico files, or have you spotted any errors or omissions? If so then please let us know by emailing us at feedback@cryer.co.uk. Thank you.