There is only one file type that uses the .OEBZIP extension:
Zipped Open eBook File
Zipped electronic publication created in the legacy Open eBook (OEB) format; contains the index, chapters, and page content of an .OEB file but compressed with Zip compression.
NOTE: The OEB standard was maintained by the Open eBook Forum, which is now the International Digital Publishing Forum (IDPF).
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Updated: July 29, 2014