I used to open sdf (sqlCE) files with visual-studio? or sql-server? I really don\'t remember.
Now I can\'t open this sdf file. With what program do I need to open it?
In addition to the methods described by @ctacke, you can also open SQL Server Compact Edition databases with SQL Server Management Studio. You'll need SQL Server 2008 to open SQL CE 3.5 databases.