This file is indexed.

/usr/share/thumbnailers/pentobi.thumbnailer is in pentobi 11.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Thumbnailer Entry]
Exec=/usr/games/pentobi-thumbnailer --size %s %i %o
MimeType=application/x-blokus-sgf;