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Windows Icon Image Format

Windows icon images (also called ICO images) are used to save icons for files and folders for Windows. They have a ".ico" extension.

Windows icon images can hold resolutions between 1 and 256 pixels in each dimension. You should use this format for saving application and document icons for Windows. And if you need to do that, then we feel your pain.

Windows icon images are also used for creating favicons for web sites. To create a favicon, use the Favicon template in the Web category.

Note: Only Windows Vista supports Windows Icon images with a size of 256 px.