Thank you for trying Test Studio.
The reason you are receiving this error is because Windows Calculator is not a WPF application. Test Studio works only with:
- Web based HTML/ASP/ASP.NET applications
- Web based Silverlight applications
- Silverlight Out Of Browser applications
- WPF desktop applications
If you want to try Test Studio with WPF sample demo application like calculator or Notepad, you can download them from MSDN.
Looking forward to hearing from you.
the Telerik team