I have a database backup (.bak) from SQL Server v7, how do I convert it for load into v10?
You can restore a SQL 7 backup on a SQL 2005 instance, then backup/restore or detach/attach to SQL 2012 or 2014.  "version 10" is SQL 2008, so you wouldn't want to stop there, probably.  You can get old installs of SQL from MSDN Subscriber Downloads, or the Express Edition is still available for download.