/usr/share/thumbnailers/blender.thumbnailer is in blender-data 2.79.b+dfsg0-1.
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=/usr/share/blender/scripts/blender-thumbnailer.py
Exec=/usr/share/blender/scripts/blender-thumbnailer.py %i %o
MimeType=application/x-blender;
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