889 Microsoft Multiplan 4.0 Spreadsheet Microsoft Multiplan was early spreadsheet software, which was replaced by Microsoft Excel. Version 4 used the same BIFF file format as Excel 2.0. Text 1 Digital Preservation Department / The National Archives 28 Sep 2009 04/2024 (v.118): Description and links added as part of PRONOM Research Week 2023. Brigham Young University. 17 Apr 2024 fmt/162 PUID mod File extension