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Originally Posted by binaryhermit
Wouldn't surprise me if there's some old reader, like, that predates the Kindle, that doesn't.
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There is/was. But that device was the Sony Reader PRS-500. But Sony eventually modified it to handle ePub. So there shouldn't be any Readers in use that do not handle one of those three formats.
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But that's an extreme corner case, to the point where anyone in that situation probably has a way to interface with the rest of the world such as using Calibre for conversion
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Besides, even if there is a PRS-500 that doesn't handle ePub, Calibre can convert to LRF. But I would find it highly unlikely that someone would need LRF for this specific eBook.