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Windows ICO File Format Evolution

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Basic Features: ICO format stores computer icons in Windows with multiple sizes and colors
All Windows icons must be in ICO format for display
CUR format is similar for non-animated cursors with hotspot information
Historical Development: Windows 1.0 introduced 32x32 monochrome icons
Windows 3.0 added 16-color support
Win32 supported up to 16.7 million colors and 256x256 pixels
Windows 95 introduced DIB engine with 256-color default
Windows XP added 32-bit color support with 48x48 default size
Windows Vista introduced 256x256 32-bit color support and PNG compression
Technical Details: ICO files use ICONDIR structure with ICONDIRENTRY for each image
Images can be stored in BMP or PNG formats
Windows XP supports custom AND masks for 32-bit images
PNG format recommended for 256x256 icons in Vista
CUR files cannot use PNG, must use BMP format
File Structure: ICO/CUR files contain ICONDIRENTRY structures for each image
BMP images must exclude BITMAPFILEHEADER structure
PNG images must be stored in 32bpp ARGB format
All values represented in little-endian byte order