/usr/share/tracker/extract-rules/ is in tracker-extract 1.6.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/tracker/extract-rules/10-abw.rule
/usr/share/tracker/extract-rules/10-bmp.rule
/usr/share/tracker/extract-rules/10-comics.rule
/usr/share/tracker/extract-rules/10-dvi.rule
/usr/share/tracker/extract-rules/10-ebooks.rule
/usr/share/tracker/extract-rules/10-epub.rule
/usr/share/tracker/extract-rules/10-flac.rule
/usr/share/tracker/extract-rules/10-gif.rule
/usr/share/tracker/extract-rules/10-html.rule
/usr/share/tracker/extract-rules/10-ico.rule
/usr/share/tracker/extract-rules/10-jpeg.rule
/usr/share/tracker/extract-rules/10-mp3.rule
/usr/share/tracker/extract-rules/10-msoffice.rule
/usr/share/tracker/extract-rules/10-oasis.rule
/usr/share/tracker/extract-rules/10-pdf.rule
/usr/share/tracker/extract-rules/10-png.rule
/usr/share/tracker/extract-rules/10-ps.rule
/usr/share/tracker/extract-rules/10-svg.rule
/usr/share/tracker/extract-rules/10-tiff.rule
/usr/share/tracker/extract-rules/10-vorbis.rule
/usr/share/tracker/extract-rules/10-xmp.rule
/usr/share/tracker/extract-rules/10-xps.rule
/usr/share/tracker/extract-rules/11-msoffice-xml.rule
/usr/share/tracker/extract-rules/15-gstreamer-guess.rule
/usr/share/tracker/extract-rules/15-playlist.rule
/usr/share/tracker/extract-rules/15-source-code.rule
/usr/share/tracker/extract-rules/90-gstreamer-audio-generic.rule
/usr/share/tracker/extract-rules/90-gstreamer-image-generic.rule
/usr/share/tracker/extract-rules/90-gstreamer-video-generic.rule
/usr/share/tracker/extract-rules/90-text-generic.rule