This file is indexed.

/usr/share/dx/samples/data/mri.general is in dxsamples 4.4.0-3.

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

The actual contents of the file can be viewed below.

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file = MRI.data
grid = 128x128x16
format = msb binary
type = unsigned short
positions = 0, 1.773153, 0, 1.773153, 0, 2.066667