Games - ICO

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The ICO file format is an image file format used for icons in Microsoft Windows. It contains small images at multiple resolutions and sizes each of which is made up of two bitmaps: the and bitmap and the xor bitmap. The and bitmap is 1 bit and is applied first to decide which areas of the image are affected by the background. The xor bitmap is then applied using xor. This allows for transparent areas in the image but also allows for inverting the background and other tricks. Originally 32x32 pixels square and using 16 colours, more recent versions of Windows support icons at multiple sizes and colour depths. Current icon files hold images of typically 16x16, 32x32, and 48x48 pixels at 4, 8, and 32 bit colour depth.

The official IANA registered MIME type for ico files is image/vnd.microsoft.icon. Before this was registered image/x-icon was the accepted option that complied with the rules of using x- for unregistered tokens. However, many others are seen, including image/ico, image/icon, text/ico, and application/ico.

Recent versions of the GIMP have limited support for ico files.

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