I want to migrate email history to profile 2. It's available on the c-drive or usb drive it won't let me browse to the location when i click import.

We set up two profiles in Thuinderbird. Two addresses, Two address books, etc. I want to migrate email history to profile 2 in thunderbird. when I get to IMPORT it does not give me the option of browsing to the location of the outlook express file for profile 2. I just imports the profile 1 historical data. The email I want to import is on the c-drive and I have also put it on the usb flash drive. but I can't get to it to import it. If I just let it import, at brings in the profile 1 history to profile 2. Importing the history to profile 1 worked fine, by the way. I am migrating from outlook express on xp machine to window 8.1