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Visual Studio 2010 - Can't open O/R Designer

I just got Visual Studio 2010 and need to create a web application using LINQ to SQL. I started writing the web app but can't add a .DBML file to the solution. The option isn't there when I go to Add -> New Item.

Am I missing something from the installation CD? Did they change something from Visual Studio 2008? I haven't written in .NET for about a year, so I'm out of the loop.

Thanks very much for any help.

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