Importing from 2008 Std Edition into 2012 Express

Hi

I have created a backup of a database in Sql Server 2008 standard edition and am trying to restore it to a Sql Server 2012 express edition.

I am using the following script

restore database from DISK = 'E:\MyTempFiles\backup.bak'

When I try this I am getting the following error

Msg 3241, Level 16, State 7, Line 1
The media family on device 'E:\MyTempFiles\backup.bak' is incorrectly formed. SQL Server cannot process this media family.
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.

The size of the database file is only 1GB so less than the 10GB limit.

I am using Sql Server Management studio 2012 (version 11.0.3000.0)

Dave