Carry out a search (go to start, search all files and folders) for *.wab look for the one with your name or the log on name you are using against it, this will almost certainly be the largest .wab file. It may require you to alter the folder settings to show hidden files (explore, tools, folder options, view, show hidden files and folders). Also make sure that "Display the full path in the address bar“is selected and that “Hide extensions for know file types” is not.
Having found this file and it’s location you will need to import it into your new build.
SuperCub