/usr/share/thumbnailers/gsf-office.thumbnailer is in libgsf-bin 1.14.41-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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TryExec=gsf-office-thumbnailer
Exec=gsf-office-thumbnailer -i %i -o %o -s %s
MimeType=application/msword;application/vnd.ms-excel;application/vnd.ms-powerpoint;application/vnd.oasis.opendocument.chart;application/vnd.oasis.opendocument.formula;application/vnd.oasis.opendocument.graphics;application/vnd.oasis.opendocument.graphics-template;application/vnd.oasis.opendocument.image;application/vnd.oasis.opendocument.presentation;application/vnd.oasis.opendocument.presentation-template;application/vnd.oasis.opendocument.spreadsheet;application/vnd.oasis.opendocument.spreadsheet-template;application/vnd.oasis.opendocument.text;application/vnd.oasis.opendocument.text-master;application/vnd.oasis.opendocument.text-template;application/vnd.openxmlformats-officedocument.presentationml.presentation;application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;application/vnd.openxmlformats-officedocument.wordprocessingml.document;application/vnd.sun.xml.calc;application/vnd.sun.xml.calc.template;application/vnd.sun.xml.draw;application/vnd.sun.xml.draw.template;application/vnd.sun.xml.impress;application/vnd.sun.xml.impress.template;application/vnd.sun.xml.math;application/vnd.sun.xml.writer;application/vnd.sun.xml.writer.global;application/vnd.sun.xml.writer.template;
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