I know that an IPSW is an iOS firmware restore file. When you want to install a beta firmware, Apple ships these. This website stores all old iOS versions in that format.
What exactly is in an IPSW file and in what format?
Can I view the files in it? Do I use a hex editor, or something else? Is an IPSW like a zip file (like .app or .bundle), or is it binary encoded or encrypted?