I really wouldn't lose any sleep over it. The Win8 app has been out for a considerable length of time now (over a year, certainly) and there's no sign of plain old files being superseded in any other device or app. Amazon have released several new hardware Kindles since the Win8 app came out, with no change in their file storage. Why they chose this approach for the Win8 app specifically I've no idea, but there's no evidence to suggest it's some sinister machination to make life more difficult for friends of Alf.
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