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I'm not asking for a convertor for Excel 4 to open Excel 2003 files.
I'm simply asking for Excel 95 or Excel 97. Excel 4 was not that old
when Excel 95 or 97 came out; presumably convertors were available
at the time. Excel 97 seems to open Excel 2003 files okay, which is
4 versions distant rather than just 2.
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You're wrong. There were no converters at the time Excel 5 came out. Microsoft
expected you to upgrade to Excel 5 if you wanted to work with Excel 5 files.
Excel 5/95 does *not* open Excel 97 workbooks because Microsoft changed native
file formats between 5/95 and 97 versions. Microsoft hasn't changed file formats
in subsequent Excel versions (though they've apparently added features that are
simply transparent to older versions, such as colored worksheet tabs). That's
the reason Excel 97 can open Excel 2003 files.
FWIW, Lotus and Borland/Corel never provided file format converters for 123 or
Quattro Pro. Indeed, I'm not aware of any software company that has ever been
foolish enough to undercut sales of its latest versions by providing file format
converters that would allow older versions of software to work with newer file
formats. Backward compatibility (newer software can read older file formats) is
a necessity. The reverse would only stifle revenue growth.
It's conceivable that DataViz's ConversionPlus package can convert Excel 5/95 or
subsequent .XLS files to Excel 4 .XLS format, but you'd find it cheaper to buy
Office 97 or 2000 from an auction or used software site. Cheaper still may be
recent but not current versions of Lotus SmartSuite or Corel WordPerfect Office,
which both can load Excel 97 .XLS files and save as Excel 4 .XLS files.
AFAIK, these are your only alternatives.