I imported a few hundred text files into Calibre, spending quite a bit of time carefully setting up the author, series etc. I converted them to ePub and imported them into my Sony reader.
Only after doing all the work did I notice that a lot of them were displaying apostrophes on the reader as a question mark. In Calibre's reader they were not displaying at all.
I traced the problem to the originator of the text files choosing to use 0x92 as an apostrophe in a lot of the files.

This is actually an acute accent, I think. And, interestingly, Calibre is converting it to a 0xC2 followed by a 0x92 in the epub. And not displaying it / them.
I'm not blaming Calibre for this, But, can anyone suggest how to recover from this without an insane amount of work?
Thanks, D