This file is indexed.

/usr/share/sludge/yuv.vert is in sludge-engine 2.1.2-3build1.

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

The actual contents of the file can be viewed below.

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void main()
{
	gl_Position = ftransform();
	gl_TexCoord[0] = gl_MultiTexCoord0;
}