I save a file in the default format.
Excel 2003 chokes so badly on it that it needs to recover and restart. Text and formatting is missing. Sheet names go back to default names.
LibreOffice 126.96.36.199 is much the same, except some of the formatting survives.
I use "save as" and save the same file in the 97 format.
Excel loads it perfectly. Even my multiple cell selections in the various sheets are there.
LibreOffice is much the same, but some floating-point numbers are slightly off. Not the fault of Spread32.
I try the 95 format.
Excel messes up some of the formatting, some of the number are a little bit off.
LibreOffice chokes on a few functions, like averagea. Let's forget 95. It sucks.
So, the 97 format is good, but only if I use "save as". If I do a binary file comparison between default and 97, there is one difference only. 2 bytes have switched places.
Spread32.exe is version 2.05.
And all of this because I couldn't figure out how to delete a misplaced command button in Spread32...