This article is from the Spreadsheets FAQ, by Russell Schulz casfaq@locutus.ofB.ORG with numerous contributions by others.
8.1 What file extensions do different versions use? (spreadsheets: Lotus 1-2-3)
WKS : release 1A
WK1 : release 2
FMT : format of release 2 (wysiwyg)
WK3 : release 3
FM3 : format of release 3 (wysiwyg)
WK4 : release 4 and 5 (includes format (wysiwyg))
123 : release 97
8.2 How can I recover a corrupted file? (spreadsheets: Lotus 1-2-3)
see http://www.geocities.com/CapitolHill/5186/ [removed? 1998/Jan/23]
8.3 Opening Quattro Files (spreadsheets: Lotus 1-2-3)
see ftp://ftp.support.lotus.com/pub/desktop/123/win3x/utils/qpwtrans.exe
 
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