The database 'AdventureWorks2012' cannot be opened because it is version 705

While attaching an .mdf file of the Adventure Works 2012 database, I got the following error:

The database 'AdventureWorks2012' cannot be opened because it is version 705. This server supports version 655 and earlier. A downgrade path is not supported.
Could not open new database 'AdventureWorks2012'. CREATE DATABASE is aborted. (.Net SqlClient Data Provider)



It seemed to be a rather silly mistake where I had copied the .mdf for Adventure Works 2012 in a SQL Express 2010 folder. Here’s the set up screenshot on my machine



Instead of copying the .mdf to MSSQL11.SQLEXPR12 (which is the folder setup for SQL Express 2012), I had copied it to the MSQL10 folder.

The fix was simple, I copied the file to the correct folder, ran SQL Management Studio as administrator and bingo! The error went away!