Unable to attache mdf file on SQL Server 2014

I have MS SQL Server 2014 on my Windows 8.1 Pro machine. However, I couldn't find any sample database for 2014 version and hence I am trying to attach AdventureWorks2012_Data mdf file by right clicking the Database on my SSMS's database icon in object explorer, and I couldn't navigate to the location to where the file actually exists. Is there any database available which is compatible with 2014 version? I believe SQL Server 2012 can't be installed on Windows 8 as per the specs mentioned here

Please let mek now how should I solve this problem?