I'm trying to attach the data file of Adventureworks. I have download the file from http://msftdbprodsamples.codeplex.com/releases/view/55330
When I try to attach the file (I remove the log file because I don't have one) I receive the following error:
The header for file 'C:\AdventureWorksDW2012_Data.mdf' is not a valid database file header. The FILE SIZE property is incorrect.
My SQL Server version is SQL Server 2012 Developer edition with sp1
Can someone help?