This file is indexed.

/usr/share/games/neverball/textures/mtrl.shader is in neverball-common 1.6.0-3.

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

The actual contents of the file can be viewed below.

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textures/mtrl/invisible
{
	qer_trans 0.50
	{
		map textures/mtrl/invisible.tga
	}
}