At Christmas last year I made a complete back-up which came to 6.1Gb. This March my computer crashed and I had to re-install the operating system and all of its programs including Thunderbird. But the backup zip file (when extracted to a folder from the zip file) is in sqllite files, not profile or ics calendar formats. Thus the backup cannot be restored. How do I get Thunderbird to accept these types of files to import the address book, calendar and message filter?