Estensione: .ico Sviluppato da: Microsoft Tipo: Graphics file format for computer icons Tipo MIME: image/x-icon, image/vnd.-microsoft.icon In computer science .ico (abbreviation in English of icon, or icon) is an extension for files that contain small images in raster graphics. Before becoming an IANA standard, it was originally a proprietary format with public specifications, used for icons in the Microsoft Windows operating system.