3rdpartylibs/fastreports.wpf/EndUserDesigner.WPF/App.xaml

<Application x:Class="Designer.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Startup="Application_Startup">
</Application>