It sounds as though you may be hoping to send tabular data: if so, most spreadsheets offer you some option to export sheet(s) or the full package to CSV.

However, if you're trying to deal with heavily formatted data (color coded, fonts, etc), you're probably better off sending the sheet itself -- if the recipient has access to the same spreadsheet.

But it's not clear "what" you want, really, nor "why."

But, by way of injecting something perl-ish, and since you're talking about a windows mail client, you may find what you need in one of the many Excel modules (available from CPAN or - via ppm Active State, and may also profit from reading up on w32 modules, as well