If you are building a new application today, reconsider embedding the WPF viewer. SAP recommends using the or OData services to render reports in a modern web front-end (React, Angular, etc.). The WPF viewer is legacy technology.
When downloading DLL files from third-party websites, be cautious of potential risks, such as: sap business objects.wpf.viewer.dll download
Do you know which of Crystal Reports the app uses (e.g., 13.0.x)? If you are building a new application today,