preinst is in xpdf 3.02-21build1.
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 dangling symlink leftover by lenny xpdf package weirdness
# (this 'fix' can be safely removed for squeeze+1)
test -h /usr/share/doc/xpdf && rm -f /usr/share/doc/xpdf || true
test -h /usr/share/doc/xpdf-reader && rm -f /usr/share/doc/xpdf-reader || true
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