/usr/share/tracker/extract-rules/10-png.rule is in tracker-extract 0.16.2-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [ExtractorRule]
ModulePath=/usr/lib/tracker-0.16/extract-modules/libextract-png.so
MimeTypes=image/png;sketch/png;
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