/etc/apt/apt.conf.d/99app-recommender is in apprecommender 0.7.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | DPkg::Post-Invoke {"[ ! -x /usr/bin/apprec-apt ] || apprec-apt --post-invoke";};
DPkg::Pre-Install-Pkgs {"[ ! -x /usr/bin/apprec-apt ] || apprec-apt --pre-install-pkgs";};
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