/usr/share/thumbnailers/hwp-thumbnailer.thumbnailer is in gnome-hwp-support 0.1.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Thumbnailer Entry]
TryExec=hwp-thumbnailer
Exec=hwp-thumbnailer -s %s %u %o
MimeType=application/x-hwp
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