Interpreting an xls file will probably be a very, very (did I miss a very), difficult task. MS has it's own way(s) of storing data , and you should first see how much you can find about how and why they do that -> I'd imagine no easy feat....they do things their own way for a reason).
I don't believe there is a simple way to do this, and while the experts are willing to help you work through specific problems you may be having, I can't imagine too many of them doing the whole project for you.....
Is there a particular reason why you need to interpret the xls file? The earlier suggestion of using a csv (or comma seperated vector (or value?) I think){which excel supports} is probably your easiest option......
You'd probably need to start off by reading the Microsoft Excel File Structure documentation that has been compiled by OpenOffice.Org. Most of the data in an excel file are "non-printable" characters. There is actually quite a bit of data to parse through as well. IIRC, a blank excel .xls file is still ~13.5 KB.
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