* AddFromZip does not use RetrieveFileInfo, so it ends up with entries of size zero (this is is easy to fix)
* TZipRead.Create ignores folders
* TZipWrite does not support adding folders
The last two issues are the most problematic,
In that particular .ods, if the empty folders are missing, this is detected as a corrupt .ods
To create a test .ods just create a new spreasheet in LibreOffice, and hit "save".
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