Transferring Multiterm termbases to a new computer

Hi, I purchased the 2019 update for freelance studio 2015 and everything was working fine. I purchased a new computer and transferred my Termbase files by zipping them and putting them on a flash and then unzipping them onto my HD. I can open the folder and see the files. But when I try to add them to a project, the project wizard in Studio doesn't find ANY files with the right extension. What am I doing wrong? Thank you so much for your help!