![]() ![]() Besides, the height size is double, because it includes a mask. The header is followed by a block containing all the image bitmap data in a contiguous manner.Ī color ICO file differs from a monochrome one in that the image bitmap is in color. The ICO file structure consist of a fixed header that contains information on the amount of images included, and information about each image, including width, size, color count and more. ![]() Once in memory, an ICO file has the same structure as an icon in a DLL or EXE file. However, common sizes are 16, 32 and 48 pixels square.Īn ICO file stores the icon resources in a directory structure. Windows doesn’t put any restriction on the size of an icon. The sizes of the system large and of the shell small cannot be changed by the user. The shell large size is stored in the registry under the following key: HKEY_CURRENT_USER\Control Panel\desktop\WindowMetrics\Shell Icon Size. The shell small size is defined by Windows. The system large size is given by the video driver. The system small size depends on the caption size. Thus, the four sizes are named: system small, system large, shell small and shell large. Windows considers four icon sizes, as the system itself considers small and large icons, and the shell also considers small and large sizes. The structure of icons stored in these file formats differ very little from the ICO file format structure. In addition, icons can be stored in DLL and EXE files. The Windows programs extract the correct color and depth values according to the context. An ICO file can contain multiple images, each with different values of color and depth. The ICO file format is an image file format that contains a computer icon for Windows. ![]()
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