Excuse me for top-quoing, my phone forces me. LilyPond intentionally changes non-alphanumeric characters to the underscore for the output-suffix. It doesn't do that for \bookOutputName, however.
I recently got bitten by this too and changed Frescobaldi so that it recognizes the changed characters when looking for LilyPond-generated output files. -- Wilbert Berendsen (www.wilbertberendsen.nl)
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