[DiapDealer]

I'm sure any structural errors that prevent Azardi from opening them could be corrected. Unless it's Azardi that's at fault, of course. There was a time I had to notify Azardi that it would not properly render Sigil created epubs that were spec-compliant in every way.

EDIT: Yes, the mimetype file and the META-INF folder are simply one-level too deep in the archive produced. That could be easily corrected (and then Azardi would--or should-- open it).