AdventureWorks2012: "The FILE SIZE property is incorrect" error while trying to attach sample database "Adventure Works for SQL Server 2012" I am trying to attach the sample databases, for example, AdventureWorks2012_Data.mdf from codeplex "Adventure Works for SQL Server 2012" into a MS SQL Server 2012 (default) instances on a a virtual machines under MS Windows Server 2008 and MS Windows 7.  

Each time I am getting the error:


  The header for file 'C:\Program Files\Microsoft SQL
  Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\AdventureWorks2012_Data.mdf' is
  not a valid database file header. The FILE SIZE property is incorrect.
  (.Net SqlClient Data Provider)
  
  ------------------------------ For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&amp;ProdVer=11.00.3128&amp;EvtSrc=MSSQLServer&amp;EvtID=5172&amp;LinkId=20476


What can be done to attach the MS SQL Server 2012 sample databases?  

Tried to install these sample databases ак the script(s), also always getting the error, the different one, about which I shall ask in a separate question.
Try downloading from AdventureWorks Databases – 2012, 2008R2 and 2008.

This might be due to corrupt installs.