Avoid the download altogether.  I recently used http://peerwire.de/goxdb/ and the balance shown reconciled precisely with my numbers.  Below is my  'Subject:Account creation confirmation letter' (altered for security).  You will need the information in bold.   This info may also have been included with PW resets or other communications.  

------------------------

Welcome to Mt.Gox!

Thank you for creating your account with us.

Your login: Goxxed Victim

In order to enable your account, you need to enter your validation code on the Mt.Gox website.

Your confirmation code: 5BMI263E9NSJ7M84

Alternatively you can click on or copy it into your browser via this url:
https://mtgox.com/signup/validate?ID=a46941gg-0g5b-4c58-a111-a4925c797510&Code=5BMI625E9HFR7M84


Best regards,
The Mt.Gox Team
info@mtgox.com
https://mtgox.com/