Sigil will warn you when trying to include internal file names with non-ascii characters, but it will still let you do it if you insist. I've played around and was able to save/open epubs with some basic latin non-unicode characters in file-names with no trouble, but I didn't get very fancy.
I'd like to believe that Sigil would always be able to open an epub that it successfully created/saved, but wouldn't bet my life on it (I'd probably bet someone else's though ... like that neighbor with the loud car at 2am).
The question should probably be; "what did you do to the epub AFTER you created it with Sigil?"
As far as being "recoverable" ... it's just a zip archive. Unzip it and see if you can salvage the files inside.
Last edited by DiapDealer; 04-22-2015 at 04:39 PM.
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