Sometimes you can get lucky and just change the file extension to
something the software will recognize. This is dicey, and may or may
not work. Step 1 is to try this only on a *backup* copy of the file,
so no data is lost in the event of an irrecoverable error. Step 2 is
to change the .wdb file extension to .mdb (MS Access) or .dbf (dBase
database file). Good luck with it!