In Windows the author and book folder names are shortened to 36 characters or thereabouts, and the format file names are shortened to 66 characters or thereabouts
I use the words 'shortened & thereabouts' because I'm not sure its always simple truncation.
I think Calibre has always done this on Windows, or at least it has since I started using it in 2011. AFAIK its a means of overcoming the limitations that Windows places on path name lengths.
BR
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