You can update 6.5 to 2000, from 2000 to 2008 and from there go to 2012 but its much better to script out the schema and bcp the data as Kin suggests. As he seems to be to humble to link to his own post I'll do it for him: http://dba.stackexchange.com/questions/20588/restore-sql-server-2012-backup-to-a-sql-server-2008-database/44340#44340