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How can I fix it? If you want to export excel that is not CSV. in angular.
Hello,
The OpenXML formats require adding the Telerik.Reporting.OpenXmlRendering NuGet package to be installed on the project with the reporting service.
Please have a look at the OpenXML and XPS options not visible. Unavailable rendering format - Telerik Reporting KB article for more details on this.
Regards, Dimitar Progress Telerik