/usr/share/tracker/extract-rules/10-ebooks.rule is in tracker-extract 1.10.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [ExtractorRule]
MimeTypes=application/x-zip-compressed-fb2;application/x-fictionbook+xml;application/x-mobipocket-ebook;image/vnd.djvu+multipage;
FallbackRdfTypes=nfo:EBook;nfo:PaginatedTextDocument;
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