Acknowledgements: libpff

Copyright (C) 2008-2018, Joachim Metz <joachim.metz@gmail.com>

This code is derived from information and software contributed by:
* Earlier work on the PST file format in libpst by
  Dave Smith <dave.s@earthcorp.com>,
  Joe Nahmias <joe@nahmias.net>,
  Brad Hards <bradh@frogmouth.net>
  and Carl Byington <carl@five-ten-sg.com>
  (http://www.five-ten-sg.com/libpst/)
* Carl Byington <carl@five-ten-sg.com> for continued work on analyzing
  the Personal Folder Format in libpst
* Igor Rogov <blizzz.prg@gmail.com> for alpha testing and bug hunting
* Krzysztof Mazur <krzysztofmazur@users.sourceforge.net> for the
  recipient list patch and bug hunting
* Warren Brown <warrenthebrown@users.sourceforge.net> for the multi
  value support, the 16-bit value patch, alpha testing, bug hunting
  and the several Visual Studio related improvements like the WIN64
  project/solution files
* Björn Ganster, X-Ways Software Technology,
  for providing the Windows extended filename patches, file exists
  speed improvement, alpha testing and bug hunting