Yes and no. CSV is very portable, but, certainly on web-pages, subject to locale-trouble. As the separator (esp on Windows) is depending on the locale setting, it might do strange things on other poeple's machines.
As XLS, the old style Excel, is very well documented, it is much safer to generate your data as CSV and convert it to Excel (.xls) yourself and use that for the CGI.
Enjoy, Have FUN! H.Merijn
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