This file is indexed.

/usr/share/kwin/shaders/1.10/cube-reflection.glsl is in kwin-data 4:5.5.5-0ubuntu1.

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

The actual contents of the file can be viewed below.

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uniform float u_alpha;

varying vec2 varyingTexCoords;

void main()
{
    gl_FragColor = vec4(0.0, 0.0, 0.0, u_alpha*varyingTexCoords.s);
}