This file is indexed.

/usr/share/gwyddion/glmaterials/Copper is in gwyddion-common 2.38-2.

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

The actual contents of the file can be viewed below.

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Gwyddion resource GwyGLMaterial
0.19125 0.0735 0.0225 1.0
0.7038 0.27048 0.0828 1.0
0.256777 0.137622 0.086014 1.0
0.0 0.0 0.0 1.0
0.1