This file is indexed.

/usr/share/thumbnailers/blender.thumbnailer is in blender-data 2.76.b+dfsg0-3build1.

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=/usr/share/blender/scripts/blender-thumbnailer.py
Exec=/usr/share/blender/scripts/blender-thumbnailer.py %i %o
MimeType=application/x-blender;