well, it is actually an add-ins provided by Aspose.Cells for RS for MS Excel. This is a report designer tool that is integrated with Microsoft Excel in Add-Ins form. With Aspose.Cells.Report.Designer you can design a report template in Microsoft Excel instead of Visual Studio.
Please use MS Excel 2007/2010 that fully supports the Aspose.Cells Report Designer client tool add-ins, if you find any issue with configurations or loading the add-ins, please see the documents for your reference, e.g