I could not get the ETI SBPubX COM interface to properly process and/or support .epub manipulations within 'any2IMP', so I cannot, at this time, add any support for converting from .epub.
Once ETI properly documents the new changes to this COM interface, then it may be possible to add this functionality.
As it stands now, the SBPubX cannot be used via Perl or Windowscript to read/write .epub, even though it did work well with .oeb.
I guess these two are really NOT interchangeable, as stated by ETI.
Growing pains....