SSRS: *.RDL file causes unknown error

I am trying to open a SSRS *.RDL file but I am getting a "Unknown Error" when trying to open in Visual Studio 2010/2012 to access the Report Designer. I can however get to the XML editor. Someone told me this is a setting in Visual Studio, SQL Server or both.

I am new to SSRS, can someone help me?
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ValentinoVBI ConsultantCommented:
To be able to edit reports in VS2012 you need to install SSDT-BI first, otherwise you won't see the BI-related project templates.  It's available for download here: Microsoft SQL Server Data Tools - Business Intelligence for Visual Studio 2012

And for VS2010 you need to install the SQL Server client tools from the ISO/DVD, more precisely the Business Intelligence Development Studio (which is VS with BI-related project templates).  You'll need the SQL Server 2012 installation package, earlier versions ship with an earlier version of VS.

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