preinst is in libwmf-dev 0.2.8.4-10.3ubuntu1.14.04.1.
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 | #!/bin/sh
set -e
# #700353
DOCDIR=/usr/share/doc/libwmf-dev
test ! -L $DOCDIR || rm $DOCDIR
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