In the Windows operating system, the file name suffix of a single icon is. ico。 Icons in this format can be viewed directly in the Windows operating system; Suffix ". ICL stands for icon library, which is a collection of multiple icons. Generally, files in this format are not directly supported by the operating system and can only be browsed with the help of third-party software.
Icon file (*. Ico) is saved in a structure similar to BMP file format, but its file header contains more information to indicate how many icon files and related information are contained in the file. In addition, the data area of each icon also contains the setting information of transparent area, and the organization of image information data is the same as BMP, which is a lossless image.
Extended data
In the graphical user interface, all resources in the system are represented by three types of icons: application icon (pointing to an executable program that completes a certain function), folder icon (pointing to a "container" for storing other applications, documents or subfolders) and document icon (pointing to information created by an application).
In Windows system, the icon with an arc arrow in the lower left corner represents a shortcut. Shortcut is a special file type, which provides quick and convenient access to some resource objects in the system. The shortcut icon is the Entity body double icon of the original object.
The shortcut icon is very useful. It is the most important way to customize the desktop and quickly access frequently used applications and documents.
Baidu encyclopedia -ICO
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