This file is indexed.

/usr/share/thumbnailers/hwp-thumbnailer.thumbnailer is in gnome-hwp-support 0.1.5-1build1.

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]
TryExec=hwp-thumbnailer
Exec=hwp-thumbnailer -s %s %u %o
MimeType=application/x-hwp