The previous conversation didn't make clear to me whether the origin point for this particular filenaming issue was Calibre, or farther up the chain. Renaming in Calibre would be less likely to cause later problems on reconversion if the origin was Calibre than if, say, that was a hardcoded-in-the-KFX-spec filename/extension, which is possible since every book has one and Amazon has been known to take advantage of such things.
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