1. Import to SQL server using DTS and again export to .DBF agains using DTS wizard.
2. You could use BCP utility. it's fast and quite simple. Check BOL for more details.
DECLARE @bcpCommand varchar(255)
, @RC int
SELECT @bcpCommand = 'bcp db_name.dbo.table_name in "' + @aFileName + '" -c -t, -S SERVER_NAME -T'
EXEC @RC = master.dbo.xp_cmdshell @bcpCommand, no_output
3. If you use or can take a few moments to learn Python, there are python
utilities to read/write DBF files. www.python.org and
www.vex.net/parnassus would be good starting points.