This file is indexed.

/usr/share/thumbnailers/gnash.thumbnailer is in gnash 0.8.11~git20130903-3ubuntu1.

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/bin/gnash-thumbnailer
Exec=/usr/bin/gnash-thumbnailer %u %o %s
MimeType=application/x-shockwave-flash;