File Extension ICO
File extension ICO is a windows icon image file created by Microsoft Corporation. The file identifies a graphics file format holding icon of different sizes such as 64x64, 32x32, 16x16 pixels and different color numbers such as 16 colors 256, 128, 64, 32 16-bit. This file format is mainly used for programs, folders or file interfaces icons at the Graphical User Interface (GUI) of latest operating systems.

Applications associated with file extension ICO include XnView, Free PDF Converter, Image Forge, ActivIcons, IconCatcher, and Gimp. This file format comes in handy when using icons with Microsoft Windows. The file contains one or even more small multiple size images and color depths. Image/vnd.microsoft.icon is the official mime type for this file format.
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It is important to note that most web servers are not configured with the mime type setting for ICO file extensions and may sometimes show a default mime type. This image format contains two types of bitmaps namely the AND bitmap and the XOR bitmap.The AND bitmap is the image mask that determines the transparent part of the icon while the XOR bitmap holds the icon that is mapped on the image mask.

Such a file extension ICO can undergo modification to come up with custom icons. To open ICO files on a windows operating system, users require IconEdit2, ACDSee Photo Manager, Adobe PhotoShop, Program4Pc PC Icon Editor and IvanView applications. For Mac users, applications used to open this file format include Adobe PhotoShop, Newera Software IconCool Editor, and Lemke Graphic Converter.
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The favicon.ico file is normally used for storage of small website logos, which normally appear on address bars of web browsers. Files with favicon.ico images normally appear on the left side of a web address whenever a website page is loaded. The favicon.ico file should be 16x16 pixels and is stored in a website's root directory for the web browser to easily recognize it. If windows fails to open file extension ICO, ensure you have installed appropriate programs for opening the file. Fix all ICO errors, run a free performance and registry scans to identify and remove errors related to the file.