Ok, thanks. Well, it's obvious the problem is with Smashwords then.
I had contacted them earlier but still have not heard back.
After Googling some more, it seems that the browser may be reporting the mimetype wrong at upload time -but still only with their service.
The funny thing is one of the recommended solutions was to upload using Chrome, except that I was already using Chrome, so that's already tried and failed.
Just for closure I'll report back if I get any decent workaround or resolution from Smashwords.
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