/usr/share/X11/xorg.conf.d/50-mtrack.conf is in xserver-xorg-input-mtrack 0.3.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | Section "InputClass"
MatchIsTouchpad "true"
Identifier "Multitouch Touchpad"
Driver "mtrack"
EndSection
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