The evolution of the ICO file format, part 1: Monochrome beginnings

Raymond Chen October 18, 2010 Oct 18, 2010 10/18/10

This week is devoted to the evolution of the ICO file format. Note that the icon resource format is different from the ICO file format; I'll save that topic for another day. The ICO file begins with a fixed header: idReserved must be zero, and idType must be 1. The idCount describes how many images are included in this ICO file. An ICO ...