/usr/share/qtchooser/qt4-x86_64-linux-gnu.conf is in libqtcore4 4:4.8.7+dfsg-5ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | /usr/lib/x86_64-linux-gnu/qt4/bin
/usr/lib/x86_64-linux-gnu
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