Emma,

On Fri, Dec 5, 2008 at 12:59 AM, Emma <emma.sender / gmail.com> wrote:
> And open the generated file, Excel show the error: "data could be
> lost", and when it open the sheet it contains a wrong number in cell
> C1... I'm doing something wrong?

alas, this is a known issue:
http://rubyforge.org/tracker/index.php?func=detail&aid=22892&group_id=678&atid=2677

I'm still working on it, and will get back to you as soon as I've fixed it.

cheers
Hannes