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As far as I understand, those IDs in the OPF are fairly recent and, by design, don't need to change. The user will never see the IDs in the OPF, they will only ever see what you put at the top of each html page in the <title> tag...and then there are some devices/apps that don't even show those. The filename that you are changing in the Book Browser pane is really for organizational purposes...and the ID in the OPF is so that you can have duplicate filenames without causing the ePub to implode.
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