@jonalbert - you *cannot* add the file to an epub using Sigil. You have to add it using your method you described in the first post of adding it manually to the "zip" file outside of Sigil. Once you have put it in the META-INF folder then as DiapDealer says it becomes a "read-only" file as far as Sigil is concerned that it basically ignores.
Perhaps one day Sigil will have the ability to add these files natively. They are an Apple-specific hack of the epub specification, but if people are going to be using Sigil to create lots of books that need this file then perhaps it needs to support it. Certainly the upcoming 0.6 release doesn't change this behaviour.
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