Copying a logical database with 2 physical files

Hi I have a customer who has a logical database with 2 physical files. How do I make a copy for test purpose. My problem is that I have received a ZIP file with the 2 files, but when I try to start the database using the first file, I get an error saying that the second file is not in the right path. How do I create my test database [V].

fin.exe database=db1.fdb+db2.fdb

Thanks, working fine.