Hi,
Welcome to MSDN forum.
Please check whether you have install the SQL Server Data Tools in Visual Studio 2015 Community through Control Panel -> Visual Studio 2015 Community -> Change ->
Modify as below image. If it unchecked, please check it and update it.
If you have install the SQL Server Data Tools, please do with following steps to open the RDLC file with Visual Studio 2015.
- Open Visual Studio and open the project which contains the RDLC file.
- Don't open the file with Visual Studio IDE directly, please right-click the file.
- Choose "Open with..." option.
- Select "Report Designer" and set it as default as below image.

If you don't have this option in that window, please download the Report Viewer 2015 Runtime from
http://www.microsoft.com/en-us/download/details.aspx?id=45496
Best regards,
joyce
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