After many failed attempts, I was able to upgrade the .QBW file.  I used File Doctor (not the Quick Fix) and the default username "Admin" and no password.  It's very frustrating that the upgrade process is so lengthy and only lets you know that the user/password was wrong at the end (after ~20 minutes in my case).

I know it's old, but QB should be able to directly import data from earlier versions of its own software in the main application.  Having to figure out that you need to download a separate "File Doctor" whose operation is poorly explained and then takes a ridiculous amount of time is not exactly user friendly.