Windows Phone: this version of Visual Studio does not have the following project types installed or does not support them

Hi,

I'm exporting a Visual Studio Project file from Unity 4.6 for Windows Phone platform. However, .sln file that created by Unity cannot be open from Visual Studio 2012.

I'm getting following error.

Unsupported This version of Visual Studio does not have the following project types installed or does not support them. You can still open these projects in the version of Visual Studio in which they were originally created. - xyz, "D:\data\may5\June22nd2ndBuild\xxx\xxx.csproj" No changes required These projects can be opened in this version of Visual Studio without changing them. They will continue to open in Visual Studio 2010 SP1 and in this version of Visual Studio. - xyz, "D:\data\may5\June22nd2ndBuild\xxx.sln