How do I get Local Database files to work in Visual Studio 2010 B2?

In Visual Studio 2008 I can add a local database file (.sdf) and work with it just fine. In Visual Studio 2010 B2, I can add the file, but it doesn't get added to Server Explorer, and when I try double clicking on it I get this error:

The operation could not be completed. Unspecified error

Has anyone else gotten this error? Does anyone know how to fix it? Google isn't giving me much on this one.

UPDATE: I've gotten a new error message now. When I reinstalled SQL Server Compact Edition and 开发者_如何学Cthen deleted the sdf file and readded it, I get this message:

The data provider required to connect to the local data file could not be found. The file will be added to the project but the typed DataSet associated with the file will not be generated.

I guess x64 users are out of luck, this doesn't work for me either. I tried everything, installing, removing, installing other versions of Visual studio (2008), updating sql compact edition, removing it, using the original version and again the sp1 No luck. If I install VS2008, it works perfectly.