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Originally Posted by Kimberh
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How if I just offer the epub file as a download then the file will not open correct for others.
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It should open fine. If it doesn't then one of the following:
- it wasn't a properly formated ePub to start with
- it was corrupted when uploaded to the web site
- it was corrupted when it was downloaded from the web site.
Corruption can be severe or very minor. Frequently the source is a mis-configured web site that doesn't associate the proper MIME-type with the ePub file format. This can lead the downloading app/browser to make a mistake.
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I assume they need the opf file also. ...
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As others that discussed at length, no they don't need the OPF.
To avoid confusion, most users should disable/uncheck the "Save metadata in a separate OPF file" in the Prefs>Save to Disk panel. Then, when you use Save to Disk to extract an eBook for use outside of calibre you don't get the extra file. Checking the "Save cover separately" option, though, can be a handy way to get a cover image for use on the web site. One should always use Save to Disk rather than probing into the calibre's library folder tree manually.