.SITES File Extension
iWeb Website Design Project
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What is a SITES file?
A SITES file is a website design project created in iWeb, a web development program for novice developers. It contains webpage layouts, text, and graphics. SITES files can be published to a live website when complete, and they are similar to .SITES2 files.
As iWeb users create websites, those websites are stored in SITES files. iWeb saves SITES files to the /[user]/Library/Application Support/iWeb directory without prompting users for a save location.
NOTE: iWeb is part of Apple's iLife application suite.