Quote:
Originally Posted by JSWolf
One thing you really need to do is make sure your ePub 3 works in ADE 2. If you try to sell a full blown ePub 3 eBook, you won't sell it as hardly anyone will be able to read it.
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Not at all relevant to the OP's request for help creating a version 3 ePub that validates.
Quote:
Originally Posted by Nautan
Hi,
I have spent weeks trying to figure out this problem and am hoping you can help me! I am trying to zip my files in the creation of an epub3. I know that the mimetype.txt file must be submitted first (without compression) and then after the OEBPS and META-INF folders - but when I do so (via Winzip, 7zip - I have tried them all!) they all produce the mimetype error. I do not have any additional elements or spaces in the mimetype file - and I am wondering whether extra elements are being added to the mimetupe file in the process of zipping (like timestamp data for example). I have been teaching myself code but am still very much a newbie. If anyone can help me with this I will be SO grateful!!!
Thank you!
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What I've bolded could have been a typo, but please make sure you didn't actually name the mimetype file "mimetype.txt". It should just be " mimetype" with no file extension whatsoever.
I'm not certain Winzip will even allow you to create a proper epub archive. Not without using terminal commands and/or flags anyway. There's a windows program floating around the epub forum here somewhere called ePubPack that claims to be able to create a proper archive from source files. I've not used it however.
As far as calibre goes, I'm not certain if you can edit/save manually created epub3s without compromising/changing the ePub3 OPF file. Never tried it.