preinst is in wine1.6 1:1.6.2-0ubuntu14.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
set -e
# Remove obsolete conf files
dpkg-maintscript-helper rm_conffile /etc/sysctl.d/wine.sysctl.conf -- "$@"
dpkg-maintscript-helper rm_conffile /etc/sysctl.d/30-wine.conf -- "$@"
dpkg-maintscript-helper rm_conffile /etc/sysctl.d/31-wine.conf -- "$@"
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