This file is indexed.

/usr/lib/mime/packages/gthumb is in gthumb 3:3.3.1-2+b2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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image/jpeg; gthumb '%s'; test=test -n "$DISPLAY"
image/gif; gthumb '%s'; test=test -n "$DISPLAY"
image/png; gthumb '%s'; test=test -n "$DISPLAY"