Cracking Excel 2000 Passwords?

So, I have a problem.

I need to crack an Excel 2000 spreadsheet with file password protection. The password could contains all letters, numbers, and symbols, and be up to 15 characters long. All programs I've tried tell me it takes months to crack. I believe this since there are literally trillions of combinations in a character set this large.

What do I do? I need the information inside the file.

Also, waiting months is not really an option.

rainbow tables + brute force

Look up social engineering.

That is, if you know who has access to the Excel spreadsheet.

Use distributed computing to crack it in days.

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