1638 Quattro Pro Spreadsheet 9 onwards Spreadsheet Quattro Pro is a spreadsheet program originally developed by Borland and now part of Corel's WordPerfect Office suite. Text 1 Digital Preservation Department / The National Archives 22 Dec 2015 This format can be identified via a container signature in DROID version 6 or later. The PRONOM database cannot currently represent container signatures. 22 Dec 2015 fmt/837 PUID qpw File extension Is subsequent version of 1637 Quattro Pro Spreadsheet