Cannot open .sdf file in VS 2012: Unspecified error

I am trying to open a .sdf file in Visual Studio Web Express 2012 . This is my local Orchard environment, but I don't think it matters much since I found this error everywhere when Googling. However, I found solutions for Visual Studio 2010 and below, so they don't seem to apply to me, because they usually include installing Visual Studio 2010 Tools for SQL Server Compact. Which obviously does not work since 2012.

Here is the error when I try to open the file directly from VS Solution Explorer:

Unspecified Error

What the hell?

When I try to configure a data connection, SQL Server Compact does not exist:

Configure new data connection

SQL Server Compact Latest -, . LinqPad:

Orchard.sdf in LinqPad

, Visual Studio 2012?

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