convert .mdf 2008 file to .mdf2005 file

I made a project in visual studio 2008 and attached a database to it... But later on it installed visual studio 2010 and it automatically updated my project... As now i reinstalled my windows and again approched to my project, it showed the following message when i double clicked my database file in the server开发者_C百科 explorer in vs 2008, vs 2008 sp1, vs 2010...

The only way to downgrade your database for SQL Server is to script out all the objects to recreate your schema on a previous version and bulk export/ import the data. Alternatively refer to backups.