Tia,
I read your issue and I might have a solution although I have to admit, it has been close, if not more than, 15 years since I last used Quattro Pro. Quattro is like Excel in that it is a spreadsheet so here is my work around for your problem. Have you tried creating a CSV file by dumping the contents of your Quattro Pro file to an OS file and the reimporting that same CSV into the new workbook? The CSV file will keep the data in a format that makes for an easy import into a "new" Quattro Pro spreadsheet once you have that file created. The actual commands for Quattro Pro to do this I can't help you with since I don't have a copy but I presume it is found on the menu line under the File selection and choosing a "Save As..." option then selecting the file type which might have several selections such as *.txt, *.xml, *.dif, etc. Make sure you select the CSV (Comma delimited) *.csv rather than any other CSV.
The only other solution I have would most likely be not what you would want to do since it would require you to have MS Excel installed.
I hope that helps you.