Unfortunately I don't really know the specifics of how it works either. It's equivalent to 'open with' in windows. i.e. you right click on an epub, you select 'Open with', and choose Sigil as the target. I assume the OS is passing the application that filename on launch somehow, but I don't know the specifics.
Anyway, not urgent in any way, just something I noticed that's likely Mac specific.
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