Check out some options how opf files might be converted to mobi format.
OPF format is the predecessor of the ePUB ebook format and nowadays not directly supported in ebook readers or management apps. However, some programs may still open it as part of ePUB support, so you may want to check epub to mobi converters for more options.
Updated: July 15, 2016
Unfortunately, there is no detailed software record in the database for this conversion.
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