ICO File Format
Contrary to a widespread belief, these files are not the same format as BMP file format.
Each ICO file contains one or more bitmap images which may be at different pixel sizes and/or color depths. The idea of this is that programs can display the most appropriate icon for the user's screen settings.
The ICO format also allows transparency so that icons do not have to appear rectangular when displayed on screen.
On the web, the most common use of ICO files, is to create a FAVICON file.
Possibly the most common type of ICO files are those containing a single 32 by 32 pixel image with a 16 color palette (although icons with larger sizes and more colors are becoming more and more common), which are always exactly 766 bytes in size.
ICO files are not compressed. However, as the images that they contain are usually quite small, compression is not really needed anyway.
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