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SQL Server 2008 Developer edition sample database install error

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I'm trying to install Adventureworks sample dB and i get an error.
I successfully downloaded the mdf file however when attach, add and click OK from SSMS I get the error:
 
Msg 5172, Level 16, State 15, Line 1
The header for file 'C:\Program Files\Microsoft SQL Server\AdventureWorks2012_Data.mdf' is not a valid database file header. The FILE SIZE property is incorrect.

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