I have been reading a LOT of google posts and StackOverflow questions about how to restore a database in SQL Server from a .bak file.
But none of them states how to just
It doesn't seem possible with SQL Server 2008 alone. You're going to need a third-party tool's help.
It will help you make your .bak act like a live database:
http://www.red-gate.com/products/dba/sql-virtual-restore/