Quote:
Originally Posted by MS-SPO
Thanks for your help in advance 
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You could use a little-known EPUBCheck loop hole and simply save them in the META-INF folder
once you've finalized the epub.
(My sample file contains 2 .mid files and passes EPUBCheck.)
However, since there's no guarantee that DRM tools won't strip or encrypt these files, you might want to follow the other suggestions in this thread.
BTW, Sigil is much more picky than EPUBCheck when it comes to epub specs and will strip the .mid files.