1147 Stuffit X Archive File The Stuffit X Archive format was developed in 2002 by Aladdin Systems, offering further compression methods and encryption options over the original Stuffit Archive format. 178 National Library of New Zealand / National Library of New Zealand 21 Feb 2014 21 Feb 2014 fmt/399 PUID sitx File extension 629 StuffIt X 'StuffIt!' starts BOF sequence, plus 3 bytes EOF 1 Absolute from BOF 0 5374756666497421 1 Absolute from EOF 0 020255