Question about msSQL 2005 backup files

 

We are Using MS SQL2005 Express in an integration project, and I started having problems with some things.  I was told by someone else that there was a problem( I don't know what exactly) with the copy of the database we were using.   This person sent me a copy of the db that worked for them, and here is my question to you guru's of MS SQL:

 

I have this  .BAK  backup file that they made for me,  of the 'Working Database'  and I was wondering if I can set it up as a database with another name,( because it is named the same thing as my 'Non-working Database'   so we can test and make sure it works,  before pointing everything at it.   Really, my problem is,  I don't know the steps to take to make this happen,  if it IS even possible.     Any help here would be HUGELY APRECIATED!!!    :)  Thanks for reading.

 

DTops