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Re:“This presentation can’t be opened because it’s too old” by yuhong on Monday March 17, 2014 @03:05PM (#7417287)
I think you can even save in Excel 5.0/95 format in current versions of Excel.
Re:“This presentation can’t be opened because it’s too old” by bananas on Monday March 17, 2014 @03:41PM (#7417543)
You can open wordperfect 5.1 (1989) in Office 2013 no problems.

Numbers can't even open ODS files at all, destroys iWork 09 documents and pretty much sticks a fork in most xslx documents.