Roberto,
Probably more than you would want to know...
http://sc.openoffice.org/excelfilefo...%20forma t%22

NickHK

"Hernandez, Roberto" wrote in message
...
Sorry.
I'm just wondering if does anybody know the internal structure of an Excel
file.
I supose it should be very complex, but if anyone can bring me a clue,
would
be great.
Thank you very much in advance.