Connecting to existing database in BCM 2007

I am no longer able to connect to my BCM data file. I can see it in Windows
Explorer but BCM does not access it nor does it show up in the Data File
Management utility. There is an .ilf and a .mdf file there.
BCM created a second database file which is empty. Any suggestions how to
re-link to the original database or at least import the data from it?
When I try to use the data import feature in Outlook it does not allow me to
import from an .mdf file.