DNSB, I don't think placing other files in META-INF directory makes it invalid epub as it is stated in the specification as well:
Quote:
3.5.1 Inclusion
All OCF Abstract Containers MUST include a directory called META-INF in their Root Directory.
This directory contains the files specified in META-INF Reserved Files. Files other than the ones listed in that section MAY be included in the META-INF directory; OCF Processors MUST NOT fail when encountering such files.
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This said I think any OCF Processor must do its best to find the properly referenced files no regardless of their location. Like all other epub readers do.
Am I supposed to edit the structure of
hundreds of epubs in my library just to be able to open them in Calibre's new viewer? How would you do this kind of exercise?