This file is indexed.

/usr/include/AL/efx-creative.h is in libopenal-dev 1:1.17.2-4+b2.

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

The actual contents of the file can be viewed below.

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/* The tokens that would be defined here are already defined in efx.h. This
 * empty file is here to provide compatibility with Windows-based projects
 * that would include it. */