/usr/share/thumbnailers/tiled.thumbnailer is in tiled 1.0.3-1.
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=tmxrasterizer
Exec=tmxrasterizer --size %s %u %o
MimeType=application/x-tiled-tmx
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