This file is indexed.

/usr/share/thumbnailers/mate-font-viewer.thumbnailer is in mate-control-center-common 1.20.2-2ubuntu1.

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=mate-thumbnail-font
Exec=mate-thumbnail-font --size %s %u %o
MimeType=application/x-font-ttf;application/x-font-type1;application/x-font-pcf;application/x-font-otf