.SITES2 File Extension
File TypeiWeb Site Design Project
What is a SITES2 file?
Project file created by iWeb, a Web development application that doesn't require users to know HTML; contains Web page layouts, text, and graphics; can be published to a live website when complete.
SITES2 files are used for storing websites as they are developed. iWeb saves them to the /[user]/Library/Application Support/iWeb directory without prompting the user for a save location.
NOTE: iWeb is part of Apple's iLife application suite.