This file is indexed.

/etc/X11/Xsession.d/75x11-touchscreen-calibrator is in x11-touchscreen-calibrator 0.2-2.

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

The actual contents of the file can be viewed below.

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if [ -f /usr/bin/x11-touchscreen-calibrator ]; then
    /usr/bin/x11-touchscreen-calibrator -d
fi