if I am not mistaken, my DT version states it does not recognize electronic books in .mobi extension “unknown format” which leads to db verification errors.
is this WAI?
if yes, if there a workaround to successfully finish verification in case of .mobi files
Not sure if that’s the case for .mobi files but for many third-party file formats Spotlight & QuickLook plug-ins are available on the internet. See e.g. http://www.quicklookplugins.com/