I stand humbly amidst the Calibre experts - however to answer the above, it bugs me that the size changes as I use an inverted dupe filter to quickly see if there are any ebook files I havent added to calibre yet (searching drives for pdf, mobi, epub)....because Calibre changes the epub file size, the method gives me false positives that mean I sometimes have to search Calibre to see if a book has been already added, considerably slowing the process .....at least I know the upside of the downside so to speak now......
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