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 is not directly supported in various ebook readers or management apps.
Nevertheless, some programs may still open it as part of ePUB support, so you may want to check epub to mobi converters for more options.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open opf file, Open mobi file
OPF
An opf file extension is related to Open Packaging Format, an XML-based format used to store e-books.
Files with opf file extension may also be found as project configurations for KEPServerEX software.
Files with opf file extension might also be found as saved albums from FlipAlbum program.
An opf file extension is related to the VisualOMP and used for its project files.
Files with opf file extension might also be found as projects from Obsidium software protection and licensing system.
MOBI
Files with mobi extension can be typically found as e-books saved in Mobipocket format, now mostly used by Amazon.
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