/usr/src/castle-game-engine-6.4/audio/ is in castle-game-engine-src 6.4+dfsg1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/src/castle-game-engine-6.4/audio/castleinternalalutils.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalefx.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalefx_api.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalefx_api_creative.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalogg.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal_al.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal_alc.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal_alctypes.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal_altypes.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalopenal_alut.inc
/usr/src/castle-game-engine-6.4/audio/castleinternalsoundfile.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalvorbiscodec.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalvorbisdecoder.pas
/usr/src/castle-game-engine-6.4/audio/castleinternalvorbisfile.pas
/usr/src/castle-game-engine-6.4/audio/castlesoundallocator.pas
/usr/src/castle-game-engine-6.4/audio/castlesoundengine.pas