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ICO is a file format used to store icons on Microsoft Windows. It supports images of various sizes and color depths, and it can contain multiple images within a single file, allowing icons to be displayed in different resolutions and color depths depending on the user’s settings. While ICO files are essential for creating application and file icons in Windows, they are less commonly used for other purposes due to their specific functionality and limited support on non-Windows platforms.

BMP3 (Bitmap Image File V3) is an image file format developed by Microsoft, commonly used for storing two-dimensional digital images in a wide range of color depths. While BMP files are capable of storing detailed images without any compression—preserving the original quality—they often result in large file sizes, making them less ideal for web usage or sharing.